I have CEL light that I have been chasing for sometime now. Had it to a Dealer and Porsche racing workshop but the problem persists.
Injectors have been replaced
O2 sensors replaced with genuine Porsche
Smoke tested for vacuum leaks
Exhaust tested for leaks

I get these codes
P2272 O2 sensor behind catalyst Bank 2 - signal too lean
P2198 O2 sensor signal biased/stuck rich Bank 2 sensor
P2195 O2 sensor signal biased/ stuck lean Bank 1 sensor

When the codes are deleted I can drive the car for hours without it coming back on (which I did on a drive through central Australia) but once I stop with the engine off, if only for 5 minutes, then start driving again the light comes back on after about 5 minutes of driving and stays on until deleted again.

Appreciate any ideas anyone would have as its been a very expensive and frustrating chase try to get that light off!