Vw passat error code p0420

Non TDI related postings will be moved or removed. VW - Volkswagen OBD- II Trouble Codes. Note: See this page for generic OBD- II codes ( they start with P0* * * ). Recent VW Forum Discussions. 0299 passat Gday 0299 code. turbo under boost. VW Diagnostic Trouble Codes ( DTCs) and data can be retrieved with VW/ Audi Factory Scan Tools such as the VAG 1551, VAG 1552, or the new diagnostic computer VAS 5051 through a Data Link Connector. I got a vw Passat 1. 8t with a p0299 code and p0420 code - Answered by a verified Audi Mechanic We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. This is kind of messed up. P0421/ 0431 are cousins to the notorious P0420/ 0430 codes that sell so many catalyic converters. P0420 is the basic " Catalyst efficiency below threshold [ bank 1} " code while P0430 is hte same for bank 2.

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  • Video:Passat error code

    Passat code error

    108 Repairguides for VW PASSAT Variant ( 3C5) 1. 4 TSI EcoFuel Component inspection procedures ( 20) Air conditioning: A/ C compressor - Engine code: CDGA. The P0420 code is set when the Catalyst monitor sees a decrease in voltage from the rear Monitoring Oxygen Sensor( s) and an increase in switching activity— from rich to lean to rich, etc. — that closely resembles the front Oxygen Sensor( s) during the time the computer is activating the Catalytic Converter monitor test. went to the dealer with my GTI VR6 and they said they couldn' t connect to the ECU. have been deleting the code every so often. recently the car has experienced some issues where it will misfire and/ or lose power. any way to isolate P0420 code? mechanics want to replace both cats ( including dpf/ cat) exhaust pressure sensors have already been replaced, light came back on. Fix code P0420 OBD2 code – Catalytic converter VW or Audi Shops are reporting a rash of P0420 OBD2 code – Catalytic converter VW or Audi. The P0420 OBD2 code indicates that the catalytic converter has an Efficiency Below Threshold ( Bank 1). A code P0421 may mean that one or more of the following has happened: The catalytic converter is no longer functioning properly An oxygen sensor is not reading ( functioning) properly.

    A P0420 code is a trouble code on OBD- II equipped vehicles. All vehicles from 1996- newer sold in North America support this generic powertrain code. This code is a pretty common one and this site is here to help the average do- it- yourself ( DIY) car owner ( like you) troubleshoot, diagnose, and fix their vehicle themselves when presented with a. Clear the fault code and use a factory- compatible scan tool to force the readiness monitors on the vehicle. If the fault code clears and the readiness monitors pass, send the vehicle on its way and when the fault code returns a second time, then replace the CAT. I just saw the check engine light come on on my VW Passat B5. 5 and did a bit of research. Some people said that it would be a faulty oxygen sensor. How to fix Code P0420 What is code P0420 Catalyst System Efficiency Below Threshold. When attach a trouble code reader and come up with a P0420, your first assumption may be that you need a new catalytic converter, simply because the words catalytic converter are mentioned in the code. I checked some VW forums and it seems to be a catalytic converter issue. Something to do with the O2 sensors in the front and back. Could anyone give me an idea on what needs to be done and how much it would cost before I take it to a mechanic? I appreciate your response. recently I pulled code P0420, AKA Bank 1: Efficiency Below Threshold.

    To start from the bginning. several weeks ago my EPC light came on so, like most educated consumers I decided to buy a vag- com. My VW Passat has a trouble code of p0420. I have changed the two 02 sensors but the light came back on after it was - Answered by a verified VW Mechanic We use cookies to give you the best possible experience on our website. P0420 code problem They said they replaced the rear 02 that day, but the light came back on two days later. Took it back to the dealership to which they said I needed an new cat which they replaced. the light came back on a day later, this time they changed the rear 02 on Wednesday, got about 30 miles and the light came back on. If you have a P0420 code in the computer along with an oxygen sensor code, be sure to diagnose and fix the oxygen sensor code first before going after the p0420 code. Plugged converters Below are pictures of real plugged converters. The engine number code letters and serial number can be found on the front of the engine near the engine / transmission joint ( Engine code AEG shown).

    The engine/ serial number may also be located on a label on the cylinder head cover and vehicle data plate. The P0420 means that the catalyst isn' t working as efficiently as it should be, but specifically it means that the post catalytic converter O2 sensor is throwing out a number that isn' t within the range that it should be. That dreaded P0420 code has been bugging me a lot lately, right about the time I put on a high- flow air filter. But placing one of those on the engine intake means the secondary air pump intake needs a tiny little high flow filter on that too. 89 Repairguides for VW PASSAT CC. 0 TSI Component inspection procedures ( 17) Air conditioning: A/ C compressor - Engine code: CCZA, CAWB. So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc. P0420 is one of the more common trouble codes that we see. Other popular codes include P0171, P0300, P0455, P0442, etc. Replacing the oxygen ( O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0421 code is combined with other codes, try fixing the other codes first. Loose fuel tank filler cap is the most common cause that triggers the P0442 code.

    It was the catalytic converter, which makes sense now considering if the O2 sensors were having problems there are specific codes for that. Catalytic converter is under a much longer warranty than the rest of your car, something like 8 years, 80k miles. p0420 depending on the dealer the intake * shouldn' t* be a big deal, but if you still have the factory intake you can throw that back on in 15 minutes before you take it to the dealer. If he cleared the code then the dealer won' t be able to do anything about it. How to access hidden service menu in VW Climatronic ( Golf, Passat, Touran. VW Golf Fault Code P0420 Diagnose Engine. In this video we have a Volkswagen Passat with a P0420. There are different ways to diagnose this code but we show you a quick way. Michael uses an infrared temperature gun to check before. Ross- Tech, LLC 881 Sumneytown Pike Lansdale PA 19446, USA Tel: Fax:. code P0420 1 Answer. my Volkswagen beetle is throwing a code of P0420 which is catalyst system efficiency below threshold bank 1.