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My 2002 Passat has already had the turbo replaced afew years ago . now I am hearing a whirring sound as I accelerate. ialso just had the catalytic converter replaced

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Well now that youer car can brthe agin its runing alot better the it has for along time so if i wear you i would find some good oil an make sure that the turbo on youre car is good n oil be for long .becuse with it runing so long wiyth no air the harder it had to work .but as of now its gitting alot more air in to the sistom the befor in it did not rigth its maks out put or as must pepelo wonuld say R.P M S AN NOW YOU ARE SO GET THAT DONE AS FASTED AS YOU CAN OK.I HOPE THIS HELPES YOU OUT

Posted on Aug 01, 2013


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Posted on Jan 02, 2017

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SOURCE: 2002 Passat 1.8Turbo

Hi Sam,

need a special sucket tool

Posted on Jul 06, 2008

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SOURCE: 2002 chevy malibu catalytic converter

You probably have way too much unburned fuel in your exhaust system (how's your mileage?) or possibly a failed oxygen sensor that is giving false information to the computer.

Posted on Feb 20, 2009

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SOURCE: Intermittent boost pressure

a bad pop off valve.  Or boost controller.  Sadly with 100K on the speedo things are far from mint.

Posted on Mar 30, 2009

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SOURCE: I have been told that


I agree that this is a common fault on this vehicle.If you are in the US, all emissions components, including the catalytic converter are warrantied for 8 years/80K miles.

This quote is quite higher ( i suppose this is a quote from a dealer ).The one that you may find for around $200 - $400 is Universal catalytic converter and it could fit your car.

Just grab a universal catalytic converter and your cost would be around $400 for parts instead of $2000.

Labor cost is again a bit high. Ideally, it should be ( assuming that it is a reputed dealer in a big state of NYC ) is around $500.

Good Luck!!


Posted on Aug 20, 2010

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SOURCE: Catalytic Converter 2002 Sonata Replace catalytic

if vehicle has less than 200,000 kms then i think cat is ok ,check the O2 sensors with a automotive meter rather than reading the obdii ,which i cannot do anyway in europe but at least you will know if they work or not their are two O2 sensors on each cat one before the and one after ,unless this is a high mileage vehicle i dont think the cats will be gone

Posted on Apr 11, 2011

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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!

Jul 17, 2009 | 2002 Volkswagen Passat

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Intermittent boost pressure

a bad pop off valve.  Or boost controller.  Sadly with 100K on the speedo things are far from mint.

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If the turbo is truly failing, then it could put metal pieces through the engine if it broke apart. Usually when a turbo fails, it's the bearings wearing out, and the turbo starts making a "dentist's drill" sound when the car accelerates. $1500 sounds pretty steep but if it's at a dealership, I can see where it would cost that much. A better bet is an independent European car specialist - usually they'll cost significantly less. Also, you can source a turbo on your own (you'd be looking for a K03s turbo) and give it to the mechanic to install, to save even more.

If you're in New York State, I could do the job in my garage for you. I can source the turbo and do the work here.

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