View Full Version : 02 sensor question.

06-02-2008, 01:48 PM
I have a 99 a4 b5 1.8t with a manual trans. Just wondering if any one out there knows which 02 sensor to replace when I get the code; 17604 oxygen (lambda) sensor heater circut B1 S1 electric malfunction P1196-35-00--. Im not sure if it's the one in front of, or after the Cat? Thanks.

06-02-2008, 02:02 PM
Bank 1 Sensor 1 is the pre cat... The 1st one the exhaust sees in the stream...

06-02-2008, 02:19 PM
Since it is your heater, make sure the heating wire has power and is not shorted.

06-02-2008, 05:43 PM
any other hints? He also had a lean condition code but it might have been caused by a vacuum leak.