Precat Oxygen Sensor - BMW Forum - BimmerWerkz.com
1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

 
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#1 (permalink) Old 07-31-2005, 02:25 AM
n00b
 
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1998BMWZ3 is an unknown quantity at this point
(Thread Starter)
Hello Everyone,

I own a 1998 BMW Z3 with 56K miles. Past few days, the CEL was going ON & OFF intermittently so bought the Fault Code Reader and the machine shows one fault code: "0A: Precat oxygen sensor".

I am not sure what that means. Do I need to replace the sensor? Any guesses how much expenses I can expect if I take it to a professional mechanic?

Also, is this a common thing or a symptom of something else being wrong?

Appreciate your inputs!
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#2 (permalink) Old 08-09-2005, 06:21 PM
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Bear is an unknown quantity at this point
You may have two O2 sensors, one in the exhaust manifold and one on the catalytic convertor, hence the pre-cat prompt.
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