UK Car Repair Questions? Ask a Mechanic for Answers ASAP
Hi my name is***** will try and help you first do you know the exact code that is stored?
Ok do you have any exhaust leaks at all and was lambda a correct fit or a universal lambda?
Ok do you have any machine to read live data ?
This really needs to be done next the code is basically saying that the voltage before the cat is low on the live data you will be able to see this and see what engine is doing at the time also an emissions test will help to see exactly what fuelling system is doing have you visually checked the wiring from connector ?
At some point the car must have seen low voltage for a period of time on multiply occasions to have registered the fault code . We used data recorders and reset system then the recorder plugs into 16 pin diagnostic plug and records all the data whilst customer drives car they then return car to us when light returns and we can analyse data and capture the moment of failure
It's highly unlikely that it's your cat as the front lambda is what the fault code if referring too and the front lambda is there for fuel control ( to make sure car doesn't run to rich or too lean ) and the rear lambda is there to give the air value after the cat to show the difference between the two lambdas . This shows that the cat is doing it's job
You are correct I misread code I'm my look up it refers to rear lambda that could suggest that you have a cat starting to age