Hi, first post is good news.
Had a recent Mot fail on my daughter's GP, lambda emissions were high. There was also an 'advisory' exhaust leak.
After searching this site I decided to start with the low cost fixes; clean lambda sensors, run through an injector cleaner, etc, before the costly replacing cat and sensors.
While extracting the lambda sensors and removing the manifold heat shield (6 bolts) I could see soot around the joint between the cat and mid-exhaust section ...the post-cat lambda sensor very near to this joint was caked too.
So cleaned both sensors overnight in vinegar and soft toothbrush, then plugged the leak with exhaust paste. After a short blast on the local A-road it passed the re-test, emissions well within limits.
I imagine this would have been fixed with a new cat, as long as it was bolted up tightly, and I'd never have known the difference. But this was my cheapest retest in years and I owe it to contributors here.
Hopefully, this can help others.
All the best and happy MOT-ing.
Rich
Had a recent Mot fail on my daughter's GP, lambda emissions were high. There was also an 'advisory' exhaust leak.
After searching this site I decided to start with the low cost fixes; clean lambda sensors, run through an injector cleaner, etc, before the costly replacing cat and sensors.
While extracting the lambda sensors and removing the manifold heat shield (6 bolts) I could see soot around the joint between the cat and mid-exhaust section ...the post-cat lambda sensor very near to this joint was caked too.
So cleaned both sensors overnight in vinegar and soft toothbrush, then plugged the leak with exhaust paste. After a short blast on the local A-road it passed the re-test, emissions well within limits.
I imagine this would have been fixed with a new cat, as long as it was bolted up tightly, and I'd never have known the difference. But this was my cheapest retest in years and I owe it to contributors here.
Hopefully, this can help others.
All the best and happy MOT-ing.
Rich