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Author Topic: Rear O2 sensor  (Read 1179 times)

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Proz

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Rear O2 sensor
« on: 02 April 2009, 16:11:38 »
Mmm my car going into Vx on saturday for a new O2 rear sensor ... i went back today to complain about my P0420 code and they say the rear O2 sensor readings are all over the place .....  im not convinced :-/
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Marks DTM Calib

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Re: Rear O2 sensor
« Reply #1 on: 02 April 2009, 16:24:58 »
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Mmm my car going into Vx on saturday for a new O2 rear sensor ... i went back today to complain about my P0420 code and they say the rear O2 sensor readings are all over the place .....  im not convinced :-/


That does break all in reality.....yes, it should be reporting a constant output but does nothing more than check if the pre-cat is still working (which is of little importnace to the operation).

Its the front sensor that supports mixture control.
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Re: Rear O2 sensor
« Reply #2 on: 03 April 2009, 08:14:41 »
I dont have a pre-cat on mine ... just one sensor before and one after the main cat .... :-/
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Marks DTM Calib

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Re: Rear O2 sensor
« Reply #3 on: 03 April 2009, 08:19:44 »
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I dont have a pre-cat on mine ... just one sensor before and one after the main cat .... :-/

Ahhh.....cheap horrible nasty awful tacky tinny after market job then!

As said, the post cat lambda does bugger all for mixture control.....so if its results are all over the place then the cat is goosed (given that its a cheap horrible nasty awful tacky tinny after market job then)

I assume that you are not having to pay for this piss poor diag!
« Last Edit: 03 April 2009, 08:20:08 by Mark »
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Proz

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Re: Rear O2 sensor
« Reply #4 on: 03 April 2009, 08:29:45 »
It was Vx that put the cat on to cure the same fault code before ... and yes i've to pay £150  :(
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Re: Rear O2 sensor
« Reply #5 on: 03 April 2009, 08:30:16 »
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It was Vx that put the cat on to cure the same fault code before ... and yes i've to pay £150  :(

And the fault code is?
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Re: Rear O2 sensor
« Reply #6 on: 03 April 2009, 08:30:59 »
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It was Vx that put the cat on to cure the same fault code before ... and yes i've to pay £150  :(

And the fault code is?

The one and only P0420.
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Re: Rear O2 sensor
« Reply #7 on: 03 April 2009, 08:31:55 »
150 quid is quite steep to....80+vat trade club and about 120 mins to fit.
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Marks DTM Calib

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Re: Rear O2 sensor
« Reply #8 on: 03 April 2009, 08:34:12 »
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It was Vx that put the cat on to cure the same fault code before ... and yes i've to pay £150  :(

And the fault code is?

The one and only P0420.


Which is cat efficiency!

Which points at a shite cat.

If it was me doing the diag I ould be looking at a live data plot....maybe they have.

Thing is that the fact its giving a changing  reading sudgests the sensor is working.....they normaly flat line when not working or respond slowly (there should be no change on a post cat sensor)

Did the code clear for a period after the cat was changed or did it make no odds?
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Re: Rear O2 sensor
« Reply #9 on: 03 April 2009, 08:34:54 »
I could have just about got the front and rear  "direct fit " ones for that price ..... £120 for the sensor but they will only take £25 to fit  >:(
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Re: Rear O2 sensor
« Reply #10 on: 03 April 2009, 08:38:12 »
It did stay away for about 3 weeks after they changed the cat .   Thing is it didnt cost me for the cat as it was done under one of those Scotsure warrantys but that has now expired , but they would have been paid to fix something which they obviously havn't fixed , so do i have any comeback and demand a fix .  Should i be paying at all  :-/
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Re: Rear O2 sensor
« Reply #11 on: 03 April 2009, 08:41:26 »
To me, you should not be paying as they have received cash to fix a fault which ahs not gone away!

Are you able to check the colours of thewiring to the O2 sensor (on the car loom) to ensure they connected it up right......three of the wires are thesame colour but, the fourth is different.

The rear should have a white with brown strip
The front mixture control one should have a Brown with white stripe
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Re: Rear O2 sensor
« Reply #12 on: 03 April 2009, 08:45:29 »
I'll try and have a look later on ... might make a phone call to consumer direct as well cause i dont think i should be paying either  :y
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Re: Rear O2 sensor
« Reply #13 on: 12 April 2009, 10:20:09 »
Well i didn't get the sensor changed after all as i mentioned to Vx that i shouldn't have to pay as they have not repaired the fault they were paid for . They then took a bit of a huff and started ranting on about conciquencial damage etc and i would need to pay .  They were then told to forget it  >:( >:(.
I then phoned Vx UK and was informed by Vx UK because i didn't actually pay for the cat replaced by the warranty the new cat doesnt come with a warranty  :o :o ... after a brief argument on the phone i told her it should have at least 12 months warranty whether i paid for it or not  to which she replied rather cheekilly " no it doesnt ".
I'll never have any work done by them again  >:( >:( >:(
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