Pic of plug looks good to me why would i be getting a po308

 

Ignition coil? I changed all four plugs and coils on one bank.

It looks a bit lean on mixture (could be just the photo itself being a bit brighter) - here's one of mine with is a nice rich colour:

 

Put the plug back in but changed the coil. Plugs have less tgan 5000 on them. I guess i have to drive it and see if it comes back. I think it has something to do with my cat getting bad , might be back pressure affecting it on full throttle. Vacuum is constant at idle, think that is ok.
thx

 

Cee_Jay used some cat cleaner after an issue with a fuel injector I think. He said it worked. Might be worth a try if you think there is a cat problem. I bought some from Canadian Tire but haven't used it.

Might be worth sicking some injector cleaner in the tank just in case that injector is acting up a bit.

 

Tried, twice . Car has ran great even with the p0430 but niw going into restricted performance p0308 , might be a glitch who knows byt i know the catalytic has to go. Got a cheap one from rock auto coming .My car is basically a weekend car so don't require a 2000 factory catalytic installed.

 

The cat cleaner DID work, for about a year and a half. The MIL came back and using the cleaner again did not help. I DID find a more involved procedure to clean them directly spraying on the media through the O2 sensor hole. I will try that next.

 

McJag i will try some injectir cleaners, cant hurt.

 

Getting multiple misfire s now believe it is catalytic related will update after i get it changed.

 

In case of web searching it's a 0 not an o: P0308

 

Because a faulty spark plug is NOT the only possible cause of P0308. Here's the relevant section from the Workshop Manual:





Although X150 uses extended DTC coding (1 Alpha + 4 Numeric + 2 Numeric), there are no extensions defined by Jaguar for P0308.

Graham