P0420 subaru forester

The code was P0420 and the mechanic said since both of the O2 sensors were fine, he concluded that I need to replace the catalytic converter. I picked up the car and drove it normally, and two days later I noticed that the check engine light was off. ... modifications and reliability history of the Subaru Forester. Show Less . Full Forum Listing.

59 posts · Joined 2015. #1 · May 23, 2020. I'd greatly appreciate some help troubleshooting a P0420 code on my '07 OB. I've reviewed many posts on this, including the P0420 Diagnosis post on the Problems and Maintenance forum, but I'm not understanding some of the basics. Many of the posts refer to checking for exhaust leaks.P0420 Hard to start Help! 2002 Forester L. 136k Manual transmission. Bought this car about a month ago (first subaru) about a week into owning the car it developed a small intermittent start issue. Basically when the engine is WARM it will crank 2-3 times then misfire. Turning the key off then back on it almost always cranks once and starts ...A full reseal with engine pulled costs $1200-$1500 at my local independent Subaru shop. The catalytic converter (aka P0420 code) issue is often a result of contamination from a failed HG issue left to go for too long. Oil and antifreeze will damage the cat, sometimes creating a blockage, and setting off P0420 codes in the check engine system.11 posts · Joined 2011. #1 · Aug 22, 2011. My 2002 Forester (5-speed) has been having rough idling issues for a month or so now but now it's undriveable due to lagging, jumping, coughing etc. It sounds like a bad Harley tune. One thing that might help diagnose it is that it only has issue when in gear and under load.Every mechanic has seen intermittent P0420's that come back after months or a year, that's common. A P0420 due to an oil filter is unheard of. More than likely the P0420 was intermittent and was going to go out and come back at some point no matter what you did. H6 OBW VDC, H6 OB Sedan, Tribeca, Lifted XT6. traildogck.Today we have a 2011 Subaru Outback with 174,000 miles. The check engine light is currently on and showing P0420. Does the catalytic converter need replaceme...

Forester 2001 L - Stock 101k Miles P0420 - Catalytic Converter Efficiency Below Threshold The forester has been throwing this code for a few months now, typically shows up on long highway runs (but to be fair, that is the vast majority of my driving). I bought a scanner from scantool.net... www.subaruforester.org.The P0420 code did not reappear after the sim was installed, but instead was replaced with a P0136 code and CEL back on. Was worth a try for a few bucks. ... Subaru Forester and as soon as I reconnected battery and started the car the CEL cleared. Excellent. In my case the headers originally cause a P0420 code, then i used a sparkplug anti ...Figured since I do as much on my car as I can it was time. Picked up an Actron PocketScan Plus (CP9410), got P0420. Cleared. Drove ~800 miles, it came back, cleared. ... We’re the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester.2005 Subaru Forester P0420 Code. Last Post. 0. 03/01/2021 12:26 pm. Topic starter. My 2005 Subaru Forester is showing a P0420 code with blinking green cruise light and solid orange check engine light sometimes on start up or will be off on start up and will randomly come on when driving down the road. Scanned it with a THINKOBD 100 OBD2 scanner ...Stopped by autozone to see what the code was and came up P0420 catalyst efficiency below threshold bank 1. ... I am not sure if this would cover your problem but it may be worth asking a local Subaru dealer. Seagrass . SOA 1-800-782-2783, MY11 Outback 3.6R Premium (Sold Jan 2022), MY12 Forester XT 2.5 (Youngest daughter) MY07 Liberty/Legacy 2.5 ...63 posts · Joined 2011. #1 · Jan 10, 2012. I have a 2004 OBW and it keeps throwing the P0420 catalytic system below threshold code. The car is bone stock. It is drive by wire and has the California emissions on it. It's engine is a model EJ259 if I remember correct. I've tried using the anti-foulers, and even the electronic fixes in the rear ...

Nov 30, 2018 · Here’s a good P0420 diagnostic order for the Subaru Legacy: 1. Check for Other Codes. The first thing you want to do when trying to fix P0420 in the Legacy is to verify there aren’t any other trouble codes. Three types of codes can give clues as to what’s going on with your car. Misfire Codes.Aug 29, 2023 · Air can and does enter cracks or small holes in the exhaust. A system in good shape does not have measurable pressure in it. The exhaust flowing through the pipe can draw ambient air in through openings. A partially blocked converter won't necessarily throw a P0420 code if it is still working as a catalyst.Subaru of America, Inc. (SOA) has determined that vehicles affected by this Service Program require ECM reprogramming. ... performed with over 100,000 miles and the Check Engine light illuminated with DTC P0420 in the ECM memory. The catalytic converter efficiency test must also indicate replacement is necessary. For all other vehicles, the ...2007 - O2 converter (P0420) / head gasket leak? Hi my high mileage (443K km) Forester has been throwing a check engine code for a while now. Got it read and it was P0420 - Catalyst System Efficiency below Threshold, Bank 1. My mechanic just called and 1) noted the head gasket leak is much worse than previous); 2) cylinder 3 is misfiring; and 3 ...

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But they do mention the 00-05 Impreza which does use the same p/n as the Forester. So it should fit. Anyway price is CHEAP CHEAP CHEAP ( $100 + 29 for shipping ) AND includes rear gasket and hardware ( hope that means new bolts ). eBay Motors: Subaru Forester Impreza Outback Legacy front y pipe (item 200277178678 end time Jan-16-09 14:04:03 PST)I pulled a P0420 code (Catalyst System; Bank 1: Efficiency Below Threshold) from our 2005 Impreza Outback Sport (EJ253 with 5 speed manual) yesterday. ... 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX; All Activity; Home ; Newer Generations of Subaru discussion ; 1990 to Present Legacy, Impreza, Outback, Forester ...Hello all, fairly new guy here. The check engine light on my 03 Forester when off the other day and it through the P0420 code. AutoZone said it could be 3 things (according to scanner) 1. Rich A/F Ratio 2. Ign System Malfunction 3. Faulty Catalytic Converter These are all pretty vague.If you want the P0420 CEL electrical fix, take a look at this link: O2 Foolers, The Economical, ... We’re the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester. Show Less . Full Forum Listing.

After reading most if not all of Cardoc's 1000+ page bible on the P0420 codes, and doing much of the testing (as best I could), I thought I'd ask for a bit of advise. ... 2009 Forester 2008 Outback 2.5i 130K PIA, 2010 Outback 2.5 103K, 139K, 156K, 192K ... I guess first / next step is to get an O2 sensor and a real live Subaru AF sensor. That ...Any brand of motor oil is suitable for a Subaru as long as the viscosity is correct. Some Subaru models require synthetic oil. The type of oil also may depend on the year of the ca...NinoS. 1104 posts · Joined 2014. #3 · Sep 8, 2020. I've used them before back when I put headers on my 03X - the fix works. You'll want to take a look at your 02 sensor and make sure you have space for a spacer (or maybe even if you can get it out), might need a 90 degree spacer (i'm not familiar with the SH forester).Technical Forums and Vehicle Assistance. Engine and Exhaust. EJ25 - 2.5L Non-Turbo (1998-2010)Infamous06X Discussion starter. 99 posts · Joined 2017. #1 · Jan 28, 2017. so yesterday i get the infamous p0420 code and cruise control was flashing for catalytic converter on the way to the dealership. i get my car serviced and they explain its a $1200 fix for a new cat installed. went home , and SEARCHED here.Hi guys. New to the forums. Just bought a 2005 Forester XS N/A and I too have the dreaded P0420. Previous owner had the catalytic converter replaced before I bough the car so I didn't think it would be a bad cat. Got under the car this weekend and found an exhaust leak where the catalytic converter bolts to the y pipe.p0420 procedure Test for P0420 code 06 Forester X. (Naturally aspirated) The Subaru tests have 11 steps. The main function of the test is to see if the o2 sensor is operating, and then to see if the operating range is correct (step 4 and 5). Step 1: hard p0420 code present. Step 2: look for exhaust leaks from heads to rear cat.Indices Commodities Currencies StocksAlso, P0420 can be the cat, but it can be a number of other things including rear O2 sensor, intake/exhaust leak messing with the air fuel ratio, spark plugs, fuel ...

Nov 30, 2020 · PO420 code. Thanks for taking the time to help. I have a 2004 Outback 2.5L automatic. J259. Code P0420. I've replaced the bank 1 sensor 1 with a Denzo brand. I've ran 2 different cleaners through the gas tank. I got the car with a blown head but had it fixed. I replaced the sensor after the head was fixed.

May 19, 2021 · Diagnostic trouble code(DTC) P0420 stands for “P0420 Catalyst System Efficiency Below Threshold (Bank 1).”. It indicates that the exhaust system’s oxygen levels are below the required threshold in Bank 1, which can damage the engine’s exhaust and fuel system. Bank 1 refers to the side of the engine that houses the number one cylinder.Fits Forester (2004 - 2005) EGR Valve Temperature Sensor A failed EGR Valve Temperature Sensor will often have no noticeable symptoms beyond a check engine light, but it does cause your Subaru Forester to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Subaru genuine ...There are many things that can cause the P0420 trouble code in your Forester. Here are the most common ones. Oxygen Sensor - The P0420 codes is thrown when the oxygen sensors on both sides of the exhaust have very similar readings. When the oxygen sensor is bad, it can cause a false reading and trigger the code.PO420 code on a 2009 forester. I've gotten this code before and I've read that it's a fairly common thing on Subarus. But my check engine light, no traction control light, and a flashing cruise control light all go off when I drive. This has happened in the past. Last time I replaced the air filter and it went off after letting the car ...I recently purchased a 2005 Subaru Forester XS, and it's beautiful! But after driving it 30 miles, the CEL popped on & the Cruise Control Light started blinking. I got home and plugged in my reader to find out it was the lovely P0420. After reading the live data, I saw my "Oxygen Sensor Current (B1-S1)" fluctuates between -127.918 mA & 127.871 mA.First, try removing and then reinstalling the gas cap. A poorly seated cap can trigger the CEL and associated warning lamps. If the cap's OK and you've still got the indicators, then see if you can get the car to an Advance Auto or Auto Zone (or similar) store and ask 'em to read the diagnstic trouble code (s) (DTC's).VSurfn. 1329 posts · Joined 2014. #2 · Jul 22, 2018 (Edited) P0420 code stands for “Catalyst System Efficiency Below Threshold (Bank 1).”. When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. Usually this means your catalytic converter needs to be replaced and/or your O2 …I kept pulling that code as well. 2006 Forester. So I pulled the O2 sensors. Still got the code. So I pulled the front Cat. Still got the code. So I pulled the rear Cat, muffler, intermediate, put in new spark plugs, and ran a cleaner. Still got the code (although now it goes on and off every couple weeks or with temperature).

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Subaru's warranty covers up until 8 years or 80,000. No other codes besides the P0420. Just tore it apart. The valve cover gasket is leaking onto the plugs and made them foul. I will replace the vc gasket and plugs and wires and see how that works. It doesn't solve my P0420 code but it will at least stop the misfiring.Good luck repairing your Subaru Forester! P0030 is a very common OBD2 trouble code. It's generic, which means it has the same definition for the Subaru Forester as any other vehicle. This code is almost always caused by a bad heated oxygen sensor or wiring issue. P0030 Definition: Heater Control - Circuit - B1S1 P0030 indicates no signal coming ...When it comes to SUVs, there’s no shortage of new vehicles that offer comfortable interiors, impressive fuel efficiency and the latest technology. Even so, the 2020 Subaru Forester...I came across this thread doing research on a potential bug in the VDCCM module on my 2008 Subaru Outback. I think the VDCCM module is raising trouble code C0042 by mistake when the CAN bus is interrupted. It should be raising C0044 on cars with an automatic transmission.The CEL would turn on and off occasionally so I changed the Wires, Plugs and coil pack and went ahead and did the 2 - O2 Sensors. Now over time I have earned 2 additional codes for my efforts. I have all three, (P0301, (Cylinder 1 Misfire Detected), P0303, (Cylinder 3 Misfire Detected), & P0420, (Catalyst System Efficiency Below …The P0420 code is set by a reading from the downstream O2 sensor. That's all that the downstream O2 sensor does, is monitor the efficiency of the cat. ... We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester.Out of the 3 tubes ive remove the outside two and left the middle one on since i believe that from the gas tank. No luck there pumps will still shut off. I also have a check engine light come on with codes P0457 and P0442. Ive searched around and people have replaced the canister and whatever other components are linked to the canister and some ...Used 2020 Subaru Forester Pricing. Used 2020 Subaru Forester pricing starts at $18,335 for the Forester Sport Utility 4D, which had a starting MSRP of $25,505 when new. The range-topping 2020 ...45853 posts · Joined 2007. #7 · Sep 2, 2022. @SueBrew on your 2001, the rear, downstream O2 sensor function is to monitor the efficiency of the CAT. It's not used by the ECM for engine management, just to give you a P0420 CEL code if too much O2 is detected in the exhaust flow.. Your only issue is that P0420 CEL code, no other CEL …Technical Forums and Vehicle Assistance. Engine and Exhaust. EJ25 - 2.5L Non-Turbo (1998-2010) ….

The P0420 is a finicky code. There is a range of "acceptable" parameters that Subaru has set. If the O2 sensor sees a value that is outside of that range, even for just a fraction of a second, you get the P0420. Adding the extension doesn't stop the O2 sensor from working, it just doesn't get the immediate read, but more of a mixed read.I look for the average of .700 mv or higher indicating a failing CAT or .500 mv indicating a working CAT. Depending on the ECM programming for CE, FE and then the new various ZEVs, the data from the O2 will vary. I'll post video links and a link back to a new post in P0420 Diag.Hello all, fairly new guy here. The check engine light on my 03 Forester when off the other day and it through the P0420 code. AutoZone said it could be 3 things (according to scanner) 1. Rich A/F Ratio 2. Ign System Malfunction 3. Faulty Catalytic Converter These are all pretty vague.How To Address a Subaru P0420 (Step by Step) NSUGS. 162 subscribers. Subscribed. 260. 16K views 1 year ago. The nerdy and keen eyed will notice I omitted …VSurfn. 1329 posts · Joined 2014. #2 · Jul 22, 2018 (Edited) P0420 code stands for “Catalyst System Efficiency Below Threshold (Bank 1).”. When you receive a P0420 code it means your catalytic converter is not operating at maximum efficiency. Usually this means your catalytic converter needs to be replaced and/or your O2 …In my case, after changing the front sensor and working through the symptoms with cardoc on the subaru outback forum, I just bought a $20 code reader and clear the code every two years to pass inspection. ... Forester, Baja, WRX&WrxSTI, SVX ; P0420 code 2011 outback H4 Theme . Default-dark . Default-Light (Default) Contact Us; Powered by ...Forester 2001 L - Stock 101k Miles P0420 - Catalytic Converter Efficiency Below Threshold The forester has been throwing this code for a few months now, typically shows up on long highway runs (but to be fair, that is the vast majority of my driving). I bought a scanner from scantool.net...Check engine light - P0420. I have an 2005 subaru forester with 82000 miles and the Check engine light is on and cruise control is flashing took it to the dealer and they replace the oxygen sensor after driving the car for about 20 mins the lights came back on.Any ideas on what should I do need help. So I went out and bought an OBD 2 …Here are the most common causes of P0455. How your Forester's EVAP system works will depend on the model year and engine type.. Evap System Hose- The EVAP hose carries fuel vapor from the fuel tank to the intake manifold can begin to leak.This will cause the P0455 code. Look for either a tear or in the hose. P0420 subaru forester, HELP: Code P0420. My 2009 forester has the "cruise" light blinking and a solid traction control off and check engine light. I got the diagnostics ran and it came out with "P0420: catalyst system efficiency below threshold bank 1". This happened to me last year but ignored the symptoms for about a month and then had to get it taken in ..., P0420 code is back on - no issues with driving or smell in vehicle (everything seems fine besides the check engine lights) ... Related Subaru Forester Subaru Subaru Cars and Motor Vehicles forward back. r/SubaruForester. r/SubaruForester. This is a place where all Forester owners can meet and discuss Forester news, mods, and general driving ..., P0420 Subaru Forester ('01-'02) Jump to Latest Follow 1 - 4 of 4 Posts. C. collier89139 · Registered. 2003 Forester Automatic Joined Feb 5, 2013 · 30 Posts ..., CLEAN Your CAT - Fix stubborn P0420 Here's what I did: On 2005 Forester XT with P0420, 1. Removed downpipe/catalytic converters. 2. Separated into upper Cat and lower Cat. 3. In a 5-gallon bucket, mixed 4 gallons water, 10 oz. Citric acid and 7 oz Oxalic acid. (Purchased on Amazon - $20) 4. Soaked main Cat in acid overnght, rinsed completely ..., GET FIXD. What Does Code P0420 Mean? P0420 definition : Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended driving with this code can cause internal …, If you want to make a combined solution of both of them, just mix the above solutions together. Here is the same thing it English units: 0.1M citric acid solution = 2.56 ounces citric acid in one gallon of total solution. 0.1M oxalic acid solution = 1.20 ounces oxalic acid in one gallon of total solution., In-dash shows P0700, P1710 and C0140. I used the Bafx and torque pro to clear the codes, it didnt clear the P0700 nor the P1710. This is a first for these codes after the new ECM. Prior to the new ECM codes were P0420 (Cat system efficiency below threshold) P0306 (Misfire cyl 6) and P2503 (Alt Circuit Low)., Subaru Forester Owners Forum is a community of enthusiasts who share their experiences, tips, and advice on the best Subaru Forester models, modifications, and reliability. Join the discussion, browse the forums, …, B. bdubbs84 Discussion starter. 13 posts · Joined 2008. #7 · Oct 20, 2008 (Edited) Well, I got rid of the P0420 catalyst code, but now I have two new codes. One is P0440 (Evap. Emission Control System Malfunction) and the other is P0136 (O2 Sensor Circuit Malfunction, Bank 1 Sensor 2). I already have the O2 sensor spacer in place., If you want the P0420 CEL electrical fix, take a look at this link: O2 Foolers, The Economical, ... We’re the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester. Show Less . Full Forum Listing., Hablamos sobre el codigo de falla dtc p0420, que lo hace activar y como se soluciona., P0420 is the front cat. It's needs to be replaced....and it'll be under warranty.. FREE. TrailAngel 2010 2.5X 5MT. Save Share. Like. J. james gais Discussion starter 13 posts ... Subaru Forester Owners Forum. 2.6M posts 191.2K members Since 2006 We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester ..., Dec 26, 2009 · 2.5x_sleeper. 45860 posts · Joined 2007. #5 · Dec 26, 2009. My guess is a failing front O2 sensor, causing an over rich condition. This would give you the gas smell & would overwhelm the CAT. The rear O2 sensor, which monitors the CAT, would give you the P0420 CEL code. Sounds like what happen in my '03. :wink:, The P0420 is the only code and it just started. The last on the VIN are 4H748003. There are no exhaust leaks that I am aware of and I have taken excellent care of my baby. I have not noticed a drop in milage, as I am still consistantly geting 24 MPG. I am thinking about trying to replace the O2 Sensors before replacing the Cat., In all seriousness, the P0420 is only good for making your wallet lighter by either ~$100 for a new sensor or several times that for a new cat. ... We’re the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester., Fixes for the P0420 Code. Here are some steps and fixes you can consider to resolve the P0420 code in your Subaru Forester: Inspect the Catalytic Converter: Check for any physical damage or signs of excessive wear. Consider professional testing to assess its functionality. Check the Oxygen Sensors: Inspect the sensors for damage or contamination., Hmm. I don't think so. Many moons ago some of the heat shield around the exhaust nearest the oil filter was rattling. I through a long hose clamp on it to tighten things up thanks to a recommendation from a friend that did so on his Forester. This is a 2011 2.5i premium 6MT. I just had the clutch done and the oil pan gasket replaced., P0420 - Catalytic Converter Efficiency Below Threshold (merged thread) (All Years) Jump to Latest Follow Follow, Sep 11, 2019 · J. Jdave Discussion starter. 7 posts · Joined 2017. #11 · Sep 11, 2019. A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for (unlikely) A damaged or failed oxygen / O2 sensor Downstream oxygen sensor (HO2S) wiring damaged or connected improperly., p0420 catalyst efficiency low bank 1. I have had my check engine light come on and go off several times in the past 9 months, but the last time it came on it did not go off, so I took it to aplace to find out what is the problem, so he hooks it uo to this snap on computer and read the code as p0420 catalyst efficiency bank 1, and he rests it., The P0420 CEL code comes from the rear O2 sensor which monitors the efficiency of the CAT. That means the rear O2 sensor is detecting too much O2 in the exhaust flow. ... We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester. Full Forum ..., The codes are: P0420: Catalyst System Efficiency Below Threshold (bank 1) P0422: EVAP Control System Leak Detected (Small Leak) I am now in a new area and went to a mechanic who wasn't familiar with my vehicle history. I explained my situation and mentioned to Rear O2 sensor issue of the past. This mechanic read the codes and said that it was ..., Replaced the spark plugs, new spark plugs wire. Tried the anti-fouler, first using 1 then using 2, that made it worst, throw me 3 more codes P2096 and P2098, and …, I have a 2018 Forester base MT with 142k miles. I switched the 02 sensor with a factory part bought off ebay and a Bosh for the lower oxygen sensor as well as an after market Cat. It keeps throwing code P0420 and has 2096, 0137, and 2270 in the history. I burn a quart oil every 450 miles and my mpg is down to 25.8 all highway driving 70 mph., This week Dana is working on correcting the issue of Code P0420, a Bad Catalytic Converter. We started this project off with a Dorman aftermarket catalytic c..., And it was the same as usual, P0420 and P0442. I've had P0420 since I got the car in june 2011, but didn't bother as, according to my mechanic, "it's just because the computer doesn't recognize the aftermarket catalyst". Back then, gaz mileage was on close to manufacturer's specs (11L per 100km city = 21MPG, ~9L/100km highway = 26MPG) so I ..., Engine/Traction Control on, Cruise blinking code P0420. I'm having an intermittent engine light on my '11 Limited. For the past several fill-ups, though not every time, the CEL and Traction Control will come on and the Cruise Control blinks. This has always happened when I'm driving at a constant speed with Cruise on., The all-new 2025 Subaru Forester was first revealed on November 16, 2023, at the Los Angeles Auto Show. Jeff Walters, president and COO of Subaru of America, presented the unveiling of the 2025 Forester, which showcases completely redesigned style inside and out. The 2025 Forester features upgraded standard EyeSight Driver Assist Technology and ..., P0420 is a major money maker for Subaru mechanics... When the rear O2 sensor measurements are our of the very narrow acceptable values, it will throw the P0420 code. ... We're the best Subaru Forester Owners Forum to talk about the best years of the Subaru Forester, modifications and reliability history of the Subaru Forester., Każda zgłoszona szkoda czy wypadek wpływa na historię ubezpieczeniową kierowcy. Ubezpieczyciele biorą pod uwagę liczbę i rodzaj zgłoszonych szkód oraz okoliczności, w jakich doszło do wypadków. Kierowcy, którzy często zgłaszają szkody, są postrzegani jako bardziej ryzykowni, co prowadzi do wyższych składek ubezpieczeniowych ..., If the check engine light comes on in your Subaru there is always a corresponding code set in the computers memory. You can read about how the system works here. Subaru Check Engine Light Part 1. Subaru Check Engine Light Part 2. One of the more common codes we see on the Subaru, is P0420 Catalytic Converter Efficiency Below Threshold., It usually gets you closer than a magic eight ball would. The short version of this is that P0026 is never due to a loose gas cap, 'bad' gas, vacuum leak, etc, unfortunately. It could be low oil, inappropriate oil viscosity, irregular maintenance, sensors, solenoids, wiring, possibly heads, etc. Like., Do you occasionally get code P0420 - catalytic converter low efficiency? This $3 electrical circuit may fix the problem permanently by electrically smoothin...