In the pic I attached the sensor is bolted into the top of box on the exhaust (the part with the red arrow on) which Im assuming is the cat. I did look up the exhaust towards the manifold but couldnt see anything jumping out at me. If your saying that there should be a sensor on that part of the ...

So is it on the part of the pipe that is running vertically up the bulkhead then?

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This is a pic of the same thing that I have found. Is this the front O2 sensor? If not where would be the front one be?

Thanks Misha, If I can work out how I can post a pic I will show you the one Ive found. Will need to work out which one I havent then....

Good Morning All,

Apologies in advance for a simple question.....

I have a 2002 C70 2.0T Convertible that I have just acquired that has a few fault codes. The first two are relating to the O2 sensor and O2 heater element.

On crawling about under the car, I have only found one on the cat facing ...