02 sensor

Rsnail · 29th March 2017, 10:29

Hi guys, my tester always reads the value of the "Hinten O2 sensor" (which means back or rear 02 sensor translated from german) at 0.4V and the other two 02 sensor fluctuate normally between 0.1 and 0.9 values, so i assume that this non fluctuating sensor is not working anymore right? If that would be the case, what would be the results of this malfunctioning? And where exactly is this sensor positioned so I can replace it? Thanks.

Billyuk1 · 29th March 2017, 22:03

i take it it's a v6 ?
i would think if both front sensors are reading 0.1 and 0.9volts they are working ok.
if the rear sensor is reading 0.4 volts all the time it sounds to me like the cat is faulty.

i may be wrong but didn't some v6's have 2 sensors and some 3?

Lovel · 30th March 2017, 09:57

The downstream or post cat sensor should not oscillate, it should be flat line if working correctly.

If it does fluctuate in line with the upstream sensors your cat is possibly done.

0.4v constant or so is fine. Taking into account the current used.

Rsnail · 30th March 2017, 11:40

Yup I got a V6 and the value of the sensor does not fluctuate. And what do you mean by cat guys? (I'm not english and don't know this particular terms). And also, where is this sensor positioned? Thank you.

suzublu · 30th March 2017, 11:56

Quote:

Originally Posted by Rsnail

Yup I got a V6 and the value of the sensor does not fluctuate. And what do you mean by cat guys? (I'm not english and don't know this particular terms). And also, where is this sensor positioned? Thank you.

Cat=catalytic converter

29th March 2017, 10:29	#1
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	02 sensor Hi guys, my tester always reads the value of the "Hinten O2 sensor" (which means back or rear 02 sensor translated from german) at 0.4V and the other two 02 sensor fluctuate normally between 0.1 and 0.9 values, so i assume that this non fluctuating sensor is not working anymore right? If that would be the case, what would be the results of this malfunctioning? And where exactly is this sensor positioned so I can replace it? Thanks.

29th March 2017, 22:03	#2
Billyuk1 Avid contributor zt saloon 1800cc Join Date: Apr 2013 Location: in my car Posts: 234 Thanks: 277 Thanked 63 Times in 48 Posts	i take it it's a v6 ? i would think if both front sensors are reading 0.1 and 0.9volts they are working ok. if the rear sensor is reading 0.4 volts all the time it sounds to me like the cat is faulty. i may be wrong but didn't some v6's have 2 sensors and some 3? Last edited by Billyuk1; 29th March 2017 at 22:11..

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30th March 2017, 09:57	#3
Lovel I really should get out more....... P6B, L550, Imp, F56, Commando Join Date: Nov 2006 Location: Aberdeenshire Posts: 2,886 Thanks: 352 Thanked 677 Times in 440 Posts	The downstream or post cat sensor should not oscillate, it should be flat line if working correctly. If it does fluctuate in line with the upstream sensors your cat is possibly done. 0.4v constant or so is fine. Taking into account the current used.

30th March 2017, 11:40	#4
Rsnail Gets stuck in Rover 75 Saloon Join Date: May 2015 Location: Essen (Oldenburg), Germany Posts: 626 Thanks: 59 Thanked 30 Times in 28 Posts	Yup I got a V6 and the value of the sensor does not fluctuate. And what do you mean by cat guys? (I'm not english and don't know this particular terms). And also, where is this sensor positioned? Thank you.