4200 fault codes

[Richie C]

Hi you helpful friendly folk! I am a fairly new owner of an early 4200 CC and recently fitted a Jaren X pipe and modified back boxes. Not sure if it's related (I didn't drive the car much pre doing this) but got some fault codes coming up from a mechanic friend - P4021 RH catalytic convertor, P4031 LH catalytic convertor, P0102 mass air flow (had a new one fitted recently), and I assume unrelated but P4063 fuel level sensor. So the general thought process is do something with the cats - any advice welcome!

 

[TimR]

None of the exhaust changes should affect an6 of those codes tbh....
Everything is downstream of the cats....
I’d clear them and see if they reappear...
Hows the battery health..?

 

[Richie C]

Thanks Tim, tried clearing and they do reappear - not sure of the battery health though so will check that thanks

 

[Zep]

They might not all be related to each other.

The cat warm up codes could be the secondary air pump, or that the lambdas are getting tired. The MAF could be the MAF itself or a vacuum leak upstream of it. The fuel level send code is probably the fuel level sender being up the swanny.

 

[Richie C]

Thanks Zep, will check these out