A few questions on my 03 jetta 2.0l P0240 bank 1 - VW Forum :: Volkswagen Forum
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post #1 of 4 (permalink) Old 11-07-2011, 04:55 PM Thread Starter
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A few questions on my 03 jetta 2.0l P0240 bank 1

SO first of I got this 2003 Jetta 2.0l
The car runs great, and has good mpg.
Now I just got the car and it had the check engine light on so I connected a scanner and this code came up "p0240 bank1"
Ive read that it could either be a bad cat, or 02 sensor.

My question is if there is any accurate way to really find out what the problem is?

Also, a friend mentioned that the 02 sensor can be cleaned. Is that possible to do?

And with that code given , how would i know which sensor to change, meaning is it the upward or downward sensor that i need to replace?

Thanks for your help.
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post #2 of 4 (permalink) Old 11-07-2011, 05:39 PM
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I have recently had the same problem, and spent entirely too much money trying to figure it out. There is NO accurate way to determine exactly what it its.

It can be:
Vacuum leak in the engine
Bad/clogged Cat
bad O2 sensors
bad/dirty MAF
absolutely no reason at all

You can clean your O2 sensors; my suggestion would be to use carb/intake cleaner, however, it's not likely to make any changes.

If you do elect to replace an O2 sensor, bank 1 is the upstream (after manifold) O2 sensor.


In my situation, it was a bad catalytic converter. The catalyst inside had literally turned sideways, and the code is thrown from the readings between the two sensors being too similar.

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post #3 of 4 (permalink) Old 11-07-2011, 05:54 PM Thread Starter
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Thanks for.ure response. With the cat being bad did you notcie any difference in ure mpg? Also, I've seen several replacements of the 02 sensor on ebay going for about 40-50 bucks are those recommended?
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post #4 of 4 (permalink) Old 11-09-2011, 06:59 AM
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its the post cat. sensor that trips that code. i had the code and cel for a few years. had the file actually deleted from my ecu. not even running the o2 sensor after the cat. no cel, no code. as for replacement oem plug and play or bosch plug and play. those $40 ones require you to cut and wire them in.

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