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redzed
09-08-13, 10:37 AM
what fault code is p0420? is this the lamda sensor which goes after the cat or one of the ones before?
andys1981
09-08-13, 10:42 AM
in my wee scanner book its saying
catalist efficiency below threshold (bank 1)
MG ZS STE
09-08-13, 11:56 AM
When i had this it was the post cat sensor. But for me its wasnt faulty, it was because i have a sports cat fitted. The mil eliminator kit sorted it for me. As i recall that was the reason i joined themgzs.co.uk as jayi-+zs was doing a discount on them when you joined.
Fred68
10-08-13, 07:46 AM
what fault code is p0420? is this the lamda sensor which goes after the cat or one of the ones before?

Post cat O2 sensor. Does it have the cat fitted?
redzed
10-08-13, 08:05 AM
currently ive got a full janspeed system with no cat, recently added the manifolds and wanted to see if that fault code was due to those frist two as i was worried i had damaged them.