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Rear oxygen sensor

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Old Sep 8th, 2019, 15:27   #1
mrfixer
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Default Rear oxygen sensor

Help needed rear oxygen sensor has an intermittent fault changed it twice okay for a few weeks. I put the original one back in lasted for couple of months now showing up as faulty. Did I read somewhere that there is a fault with the wiring or connection MOT due shortly
2003 V40 2.0 automatic
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Old Sep 11th, 2019, 20:43   #2
emtor
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Quote:
Originally Posted by mrfixer View Post
Help needed rear oxygen sensor has an intermittent fault changed it twice okay for a few weeks. I put the original one back in lasted for couple of months now showing up as faulty. Did I read somewhere that there is a fault with the wiring or connection MOT due shortly
2003 V40 2.0 automatic
Fault code?
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Old Sep 11th, 2019, 22:17   #3
mrfixer
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Cleared fault code fingers crossed just now. I can't remember the code just now but it was for the rear sensor , the car runs fine even when the engine light is on if it comes on again I will take a note of it thanks for your reply anyway 👍
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Old Sep 12th, 2019, 10:56   #4
magnuz
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The rear O2 sensor doesn't affect the way the car runs because it doesn't make any adjustments to the ecu, it only monitors the exhaust emissions after the cat to establish whether the cat is doing it's job !
However,. it may mean an mot failure if the EML is lit at the time of the mot.

Could the fault code be related to high emissions ?

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Old Sep 12th, 2019, 20:49   #5
mrfixer
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The rear O2 sensor doesn't affect the way the car runs because it doesn't make any adjustments to the ecu, it only monitors the exhaust emissions after the cat to establish whether the cat is doing it's job !
However,. it may mean an mot failure if the EML is lit at the time of the mot.

Could the fault code be related to high emissions ?
Not sure on emissions something I never thought about I only run the car a few miles to and from work it could be that I'll keep an eye on it thanks
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