I own an Alfa 156 JTS SW.
For a long while I had problems with "Check engine"! Local dealer couldnīt help me!
This failure had happens since the car nearly was new....!
The problem seems to be the lambdasensors...the last failure was P1151.
This is done:
Switching all four lambdasensors to new one (done by dealer)....didnīt fix the problem!
Reconnecting and controll of the socketsconnectors for each lambdasensor....didn't fix the problem!
Grounding each lambdasensor to the chassi.....didn't fix the problem!
I neeeed help! Local dealer tired....so am I! Love the car....but couldnīt fix the problem.