Question about 2002 Volkswagen Jetta TDI

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Wondering what the error code we were told means

My check engine light is on and when the "used car dealer" scanned it the code we were told was either P20420 or P20240. Can you tell me what they indicate? Thank you

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  • dkomer May 22, 2009

    We tried the method "snorkelbobby" recommended and the light has gone out. Will keep an eye on the issue so that if it continues to occur we might have to have some one look into it. Thanks for all of your help. I truly appreciate it.

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  • Volkswagen Master
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First, the check engine light just means you are not meeting emissions right now. Not a big deal. Try disconnecting the battery for 1/2 hour and then reconnect and drive car for 10 miles. It may run rough while it relearns you engine controls again but it often clears the codes.

Now, codes are only 5 digits so I assume the 2 is extra.
P0420 = catalyst efficiency below threshold (bank 1)
P0240 = can't find this code.

Autozone also does free scans. please rate for me, thanks

Posted on May 22, 2009

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  • Volkswagen Master
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I find no source that lists 5 digit error codes for VW or Audi (they share systems) but dropping the first ‘2’ results in the following:
 
P0420 - Converter - Low Efficiency
or  Catalyst System Efficiency Below Threshold (Bank 1)
 
I doubt that your car is equipped with a cat.
--------
P0240 - Turbocharger Boost Sensor B Circuit Range/Performance
 
This last one is more likely on target with your TDI

The codes were checked not as generic but specifically for VW & Audi.

Posted on May 22, 2009

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