182 emissions fail

[mike86c]

Hi all.
I took my brothers clio for an M.O.T and it failed on a broken spring and seized rear caliper, it passed emissions with ease. By the time a new caliper had turned up we had missed the free retest so had to book it in again ( sent the wrong caliper twice! ). I took it in today and this time it failed horrifically on emission. CO - 7.632, HC - 487.

The engine management light came on so they plugged it in and found an error code for the pre cat o2 sensor. They cleared the code and told me I was better of replacing it before retesting but on the way home the light never back on came back on.

What are your thoughts? Is it possible for the sensor to just die? Is there anything else that could be to fault?

The car has a K tech induction kit and stainless cat-back exhaust.

Thanks

 

[Amos91]

If the light came on for it I would get it replaced. £63 ish for a Bosch one from ECP.

Also if you want to cheap out, switch the post cat and pre cat lambda around and retest it.

 

[R3k1355]

Mine failed horrifically when the Pre-cat lambda died, switched it out and passed just fine.

George@RTR parts can supply ones you need.

 

[mike86c]

Cheers for replying so quickly. I have found a Bosch one for £49.95. Any idea why the light hasn't come back on? I would of thought if it was faulty it would of thrown a code again.

 

[smith647]

Doesn't the ECU have to recognise the same fault a certain number of times before it throws up a warning light? That's probably why it hasn't come back on straight away.

 

[Amos91]

Mine failed on emissions, no light, no error on a cheap OBDII. Plugged into a snap on reader and there was a lambda issue.

So it can be bad enough to fail emissions without a light.

Its this one - http://www.carparts4less.co.uk/search/710745577/p/home

Discount code - CP5LESS

 

[mike86c]

Replaced the lamdba and took it for a retest today. It passed with flying colours