2002 C70 Conv 2.0T O2 Sensor locations

Andihowe1975 · Post by **Andihowe1975** » 04 Apr 2018, 03:02

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 rearwards, is this the only O2 sensor on the car?

Thanks in advance

Andi

Post by **misha** » 04 Apr 2018, 03:08

1st one is between intake manifold and cat,second(rear) one is after the cat...towards the rear of the car.

Andihowe1975 · Post by **Andihowe1975** » 04 Apr 2018, 03:37

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....

Andihowe1975 · Post by **Andihowe1975** » 04 Apr 2018, 03:55

download/file.php?id=2666&mode=view

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?

Post by **misha** » 04 Apr 2018, 07:22

I can't see clear from the picture you posted....but i just told you in the previous post....1st(front) one is between intake manifold & cat.

Andihowe1975 · Post by **Andihowe1975** » 04 Apr 2018, 07:54

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

Andihowe1975 · Post by **Andihowe1975** » 04 Apr 2018, 07:58

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 pipe then I will need to jack it up and have another look.

Thanks Again,

Andi

Post by **misha** » 04 Apr 2018, 12:20

Yes...front o2 sensor MUST be between intake manifold & cat.That's why it's called 1st or front.
Rear o2 is ALWAYS after the cat towards the rear end of the car....and thats why it's called 2nd or rear.

Some cars have them both,some have only front one.
Check if your 2.0T is equipped with both or just have one...but being a '02...it should have both.

This should match your setup:
https://www.pelicanparts.com/techarticl ... cement.htm#