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Hello! I have a fault code on the downstream oxygen sensor that is persistent so I presume it’s broken. The code says: P0036 - heater control circuit bank 1 sensor 2. I can see where the oxygen sensor attached to the catalytic converter, but I can’t find the other end where it plugs into the electronics. Can anyone please tell me how to find it and replace it? Thank you very much. Gavin.
 

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2013 B7 2.5 L
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Gavin, it goes up under the plastic skirt on the bottom of the car. You need to back out some 10mm bolts, and you will see a support where the sensor plugs into the harness.
 
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