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Thread: O2 sensors?

  
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    nick20's Avatar
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    O2 sensors?

    Where in the engine bay do i find these? I've got 2 fault codes relating to them so i want to give them a clean up & hopefully that should clear them?

    If anyone has any pictures that would be great

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    they are the things that stick out of the exhaust
    ones just below the turbo on the down pipe and ones just after the flexi joint on the exhaust

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    Can you reach them from the engine bay or do you need to get under the car?

    Thanks for quick reply

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    Are o2 sensors generally dear? Got an error on mine that I cleared on opcom but if its dying then may as well sort it
    My name is Pete
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    80 quid or so from GM

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    Dear enough then lol
    If it was duff what would it affect?
    My name is Pete
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    I've been told its best to remove, clean and refit. It might solve it, its cheaper than buying new and if it works then you've saved money. IIRC the o2 sensor is the lambda sensor, it the sensor sticking out of the precat pipe and the exhaust as said, near the flexi pipe. Please correct me if I'm wrong!

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    You will struggle to remove the carbon deposits from a lambda sensor TBH, the only thing that might shift it would be a strong acid. Ie brick acid for example..

    However knowing how sensitive these things are I think submersing them in any kind of fluid could possibly damage them. But if its definately fubured then go ahead but I suspect your efforts will be to no avail.

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    Has anyone here actually cleaned these before? Had a look in my bay and can see the first sensor in the outlet manifold, couldn't see the other one though. Is it underneath the rocker-ish area?

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    One of them is on the precat pipe, and the downstream lambda is after the primary cat purely as a diagnostic tool to ensure the catalyser is doing its job correctly.

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