Question about 1999 Volkswagen Passat
If you can't get the computer to work, send it in to a rebuilder. Lots cheaper than buying a new or used one.
Posted on Jun 26, 2017
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Posted on Jan 02, 2017
i would like to advice you not to do this job, the person who is doing this work must have more knowlage about mechanical mainy must know how is the timing belt fitted,
timing belt is not like altaranator belt.
find a good mechanic,
if you are intersting to do like this job easy go technical schools, .
Posted on Sep 12, 2008
SOURCE: VW P421 code
This is a common problem with V6 Passats. VW put out a TSB on this a few years ago.
The code is telling you that your catalytic converter (driver's side, I think) is bad. It's more than likely not bad.
VW put out a TSB on this a few years ago. TSB 05-13. The cause of the error code is basically an over sensitive ECU (computer of car/engine) and the fix is to have your ECU flashed with the latest and greatest software. Depending on your mileage they might do it under warranty - you'll have to check.
It's still possible that it might be a bad catalytic converter - and the dealership might try to tell you that either way. Call VW (1-800-822-8987) and ask them about the TSB (I couldn't find it online).
Tell the dealership you want the ECU flashed - it's much much cheaper than a cat. No sense replacing it if it's not bad
There is a federal warranty on catalytic converters - 8 yrs or 80k miles...
Hope this helps!
Please rate/vote for me!
Posted on Jul 18, 2009
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