Hello,

My 2012 Jaguar xj has been running a bit rich after I changed the spark plugs and one injector, it's not that bad you have to get really close to the exhaust to smell it. I also added an injector cleaner to the tank what can the problem be?

Thank you.

 

OBDII codes would be helpful.

 

There are no codes the car is actually running great.

 

No codes + running great = nothing wrong.

 

Check your long term fuel trims. If they are off by more than -10 for either bank, then there may be something left to check. Otherwise don’t worry about it.

I also vaguely remember you having a potential leaky fuel injector (correct?). If so this can leave a lingering smell for a while. Drive it for a while (~1000 miles and see if it clears up).

All the best.