Help! I have this vauxhall Zafira, came to me on the back of an AA truck, broken cam belt, usual repairs, valves, rehone bores, lots of cleaning of blocked throttle body, even rocker cover vent.
The car ran really well on start up and test drive, but after customer picked up it almost immediately flagged P0130.
Scoped lambda sensor with new toy, sure enough sensor stuck on about .85v if you rev the car to about 3k the sensor will switch briely then fix on about 4.5v untill you return it to idle.
There are no air leaks either in inlet or exhaust, someone has only last week fitted a front sensor, and as the rear sensor appears to be a front one in the rear hole I swapped these and gained the same results so I do not suspect the lambda sensor.
This has no EGR, I also scoped the MAF on a snapped throttle, which looked good, am wodering if this one is faulty, perhaps I should have scoped it under both failing conditions.
Trouble is 9pm came and I wanted to get home!
Thanks for reading,Phrom fill.