Passat (B5) :: Warm Up Catalyst Codes P0421 And P0431


Jul 8, 2010

I just bought a 2002 2.8L Passat 4Motion. On the way home, the check engine light came on. My friend lent me his generic brand diag tool to scan that check engine light. It came up with two codes. The first one was:

P0421
Warm Up Catalyst Efficiency Below Threshold (Bank 1)

The second code was:

P0431
Warm Up Catalyst Efficiency Below Threshold (Bank 2)

What this means or what I need to do to fix it? Is it a matter of cleaning something or replacing something? If it's something I can figure out, I'll do it on my own. Mistakenly, I erased the code and now the light is gone--thought I was deleting the code from the handheld unit. I can't open my hood.

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I just bought a 2000 VW passat with 63k. I had it for a week and check engine light came on. 30 v engine ....

p0431 /16815 bank 1 below threshold??
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Cat? or 02 sensors???

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2003 passat wagon 2.8l v6 with p0421 and p0431...a slight miss as well...

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 miss) Went to AutoZone and came back with the codes above. I thought it might need a new coil but now I am not really sure. I want my performance back but seriously doubt cats are bad at the same time.

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Ok, so I scanned a 2006 Passat 3.6 4mo. I got a fault for the catalyst system, a fault for the AWD controller, and a fault for the Haldex pump. I'm guessing the catalyst code is for the oxygen sensors? What should be my next course of action on the AWD stuff?

============================================

Address 01: Engine Labels: 03H-906-032-BLV.lbl
Part No SW: 03H 997 033 M HW: Hardware No
Component: P3.6-FSI-LEV2 G00 2370
Revision: --H11--- Serial number: VWZCZ000000000
Coding: 0000175

[Code] ....

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Is this a converter in the early stages of failure (150,000 miles; some oil consumption)? Or is there another possibility?

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I have a code P0431 - "warm up cat efficiency below threshold (Bank 2)"

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After I have driven the car for a while and gotten it up to temperature, if I stop and let it cool for a while, when I go to start it up again, it will start easily and then immediately die. Almost like the fuel got cut off. My work around at this time is that if I manually keep the rpms up using the gas pedal it will stay running. If I take my foot off to quick it will still die but if I can do it or 20 to 40 seconds it will stay running.

Other clues:

There are no codes.

If I only drive for a shorter time, when I go to start the engine it will start but it will rev up and down (sometimes for up to ten seconds) before settling down to the proper idle.

When I start the car in the morning, it will start right up but tends to rev above 1200 rpms for about a minute or two before it will settle down.

What has been changed in the past couple of years:

IAC
MAF
EGR
Crankshaft Sensor
Wires (but not plugs)

Also the throttle body was cleaned pretty thoroughly. The guy who did it did think that the throttle body gasket was kinda iffy but intact.

I checked the FPR but no fuel leaked from it even after running the engine for five minutes.

Injectors could be going bad, maybe?? But wouldn't that cause problems other than just at a warm start?

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Cold starts fine, drives good till engine warms up to around 130+ECT then it starts acting up. Stumbles on acceleration for little bit and puts out a little black smoke until it gets moving. No check engine light or codes found.

However a month ago I had the check engine light come on with a P0404 & P0405 and it still started & ran/drove great even towing. If I reset the code it would stay off until I restarted the engine the next time. I replaced the Dorman EGR because it had a lifetime warranty and only had 5,000 miles on the first one. The code did not go away until about two weeks ago the light went off on the dash and has never come back but I had not erased the code? So I'm not sure if this is still lingering issue or what.

I was checking my ScangaugeII when I came back home today while the engine was still idling rough and this what I saw for Numbers:

Low idle in Park
ECT 193
EOT 191
FICM 49.0
IPR 21.4
ICP 582
ICV 0.81
V 13.8
TFC 1.91
VSS(fan speed) 0

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Last Friday I had to clean my throttle body butterfly valve and interior housing and I also had to replace the air inlet hose that connects the air cleaner/MAF sensor to the throttle body because the hose had some splits allowing air in. I disconnected the battery before doing any work.

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