scanned last thing tonite
came up with code of p0170 system lean
live data showed stft25% ltft25% pre cat lambda
0.00v constant post cat sensor 0.280v
tried to get pre cat sensor switching by spraying carb cleaner into air intake but no change
cleared fault code and customer coming back next week to get sorted
could this be a faulty lambda sensor or could stretched timing chain or something else cause the sensor to stay at 0.00v
cheers kev