2000 Audi A4 O2 sensor

GIOVA4

MEMBER
2000 AUDI A4
6 CYL
2WD
AUTOMATIC
120,000 MILES

Hi, they change for the third time in 3 month the 2 o2 sensor behind the catalytic converters telling me the o2 sensor are crack end now the check engine light still on egain! For the same problem. Why? They replace the the air flow sensor to.
Thank you

3 Replies

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

If the O2 sensors are failing that quickly then you need to have your catalytic converters tested. They seem to be clogged or dirty and causing issues with the O2 sensors.

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Thursday, March 26th, 2009 AT 2:28 PM

GIOVA4

MEMBER
2 POSTS

But recently they replaced the 2 bottom catalytic converter, they was not original parts, this may be a problem?
Or the problem con be something also?
Thank you again

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Thursday, March 26th, 2009 AT 3:12 PM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

It's important to buy genuine Audi parts. Even the sensors should be dealer brand. If they are not, this is probably the reason it continues. Also, check the reader (wire) on your mass air flow sensor. If it has dirt on it, it will tell the engine that there is not as much air going through it then there really is and the motor will run lean.

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Thursday, March 26th, 2009 AT 3:19 PM