Search Results for ‘p0421’

I'm getting codes P0431 Warm Up Catalyst Bank 1 Efficiency Below Threshold P0421 Warm Up Catalyst Bank 2 Efficiency Below Threshold where do start for diagnosing? It looks like both driver and passenger side, but, do these codes relate to Upstream (before the Catalytic Converter?) or...

Thought I'd share something I just experienced/learned. Last weekend I disconnected my battery to clean the drains. The next day on the way to work, the CEL came on, P0421 (cat 1 efficiency below threshold). I've owned the car through 2.5 tanks of gas and have reset the codes twice, and it...

How can I use VCDS to check measuring blocks to determine if the O2 sensor is bad? I found this thread VWVortex.com - VAG-COM procedures for testing the MAF, O2 sensors and catalytic converter but it is not specific to ATQ engines. I have a 2002 V6 ATQ. Can I use the info in the link to check...

My 2002 V6 ATQ (191K 29MPG Highway 23 City) was due for state inspection so I needed to come up with a fix for my P0421 P0431 CEL codes. I planned to replace both rear O2 sensors, but first wanted to be sure this wasn't due to poor combustion performance or an exhaust leak. So I put 1 bottle...

2002 Passat V6 ATQ check engine light came on and I get the codes below. I won't be able to test things until this weekend but I hope you guys might give me some suggestions on where to start testing. The car runs fine at idle and high speed. Address 01: Engine Labels...

I have been getting this code for the past few days now. I clear it and it comes back in a day or two. Is it saying I need new Catalytic Converters? I'm not quite sure what to do with this. And I've noticed when I have the OBDII plugged in my coolant reaches like 220-224 degrees. Is that too...

2002 GLX Sedan, car is running fine but the check engine light just came on with these codes: p0421 bank 1, p0135 B1 S1, p0155 B2S2, p0431 Bank2 If it was one side or the other I would replace the O2 sensor or add an anti-fouler, but suddenly all four of these codes at the same time and the car...

Hi guys, I got a check engine light with P0421 again. For once I didn't get it for my secondary air system. However, I got an evap code (large leak) guess what? The wawa I got gas at didn't freaking put my gas cap back on and I lost it when she said we throw them out just get a new on at walmart...

I have 144K miles on it. 139K, October had the valve cover gaskets, plugs and crankcase breather hose replaced. 140K, October alternator replaced 143K, January had the can chain tensioner gasket, cylinder head plugs. PCV system confirmed okay. I argued regarding the duplicated work. That...

So for the past few years I have had the codes P0421 and P0431, and upon driving to Denver from Oklahoma (a 10 hour drive) it disappeared, my CEL is gone! Lets be clear, I am not complaining! But I would like to know what caused it? Could it be that the long drive "fixed" something or is it...

The CEL on my 2000 ATQ V6 has been going on and off (self clearing) every 1000 kms or so for the last year and a half that I've had the car. CEL codes are P0421 and p0431. Local dealer can't tell me if it has had the software updated unless I bring it in, so this is an unknown. Wasn't really...

2005 V6 GLX ATQ I put a full can of seafoam in a full tank of gas. Saw great performance increase after the tank ran out and I refilled. About half way through the first clean tank I noticed sluggish acceleration and CEL codes P0421 and P0431, telling me I have either a bad cat, or two bad O2...

Hello everybody. As much as I hate saying this but here is another code from my lovely 2003 vw passat v6 fwd. I was driving today at around 35-40 mph and right before my eyes the CEL came on. I had to keep driving the car for about 40 minutes until I get home. I noticed no difference what so...

This CEL has been bothering me for a week now. I suspect the MAF sensor. Not sure if its bad or just keeps getting dirty because every time I clean it with carb cleaner and reset the CEL I drive 2-3 days (200 miles) with no light and then it comes back. My MAF sensor is located right next to my...

I keep getting these two codes on my 2003 ATQ V6. I've read the 2000-2001 reflash topics. I have an ECU number of 3B0907551DB and version 2.8L V6/5V G 0010, soft coding 07551 (from VCDS) is it valid for the reflash? The UCU numbers (from what i have seen) on the TSB relate to 3B0907551AN or LX...

Hello, 2002 Passat GLX V6 - prior to changing valve cover gaskets no CEL codes; after both gasket change getting P0421 - Warm Up Catalyst Efficiency Below Threshold (Bank 1); P0348 - Camshaft Position Sensor (Bank 2). I clear codes, CEL, by disconnecting battery, drive for a time and codes trip...

OK, i got my Passat V6 B5.5 a few months ago. Happy-i always wanted one! However, it threw the two codes P0421 and P0431-reduced CAT warm up efficiency bank one and two. I took it to the dealer and they claimed i needed two new CATs ($2700) nice... i didn't fall for it. The story so far: So i...

A short while back I tore into my '04 V6 GLX. Everything on the top half of the motor was in dyer need of replacement, gaskets, CCT's, timing belt, injectors, PVC system. I have been driving the car for a short while now, approx 600 miles, all of a sudden the CEL goes on while I'm out for lunch...

Okay guys here we go. For those wanting me to search...I did...lots of old posts but nothing recent...here we go... Cold start up is fine and initial driving. After car warms, there is a slight shutter at idle (just occasionally) and upon acceleration with low rpms. (It really feels like a...

I've got a 2000 2.8 V6 and it failed the Ct. emissions test with P0421 & P0431 codes. My shop says I need both catalytic converters replaced. That's $1000 each for VW original units. I can get aftermarket cats for about half that.....Any downside to that choice?