Noticed over the last few days that my AFR is not reading rich until exhauxt is very hot. By this I mean car needs to have beeen running for at least 15 minutes driving.

Not sure why as the lambda is only 2000 miles old and car is running exactly the same as before. AndyF mapped it a few weeks ago (less than 1000 miles) and lambda was reading fine then. I'm not getting any knock readings higher than before either on the Apexi comander.

Any ideas ?

 

The heating circuit on your lambda sensor is kaput. The sensor may also be on the way out.

 

I wondered if that may be the problem, oh well yet another new lambda. Cheers Harvey