Lambda regulation fault
My 24V developed a slight misfire last week. Having been here before, I cleaned up all electrical connectors under the bonnet and gave the crancase ventilator a goodly squirt of carb cleaner, having disconnected the three hoses.
The misfire is gone, but now I'm getting 1-2-2-3 (lambda) fault code and hunting at idle. I rechecked all connectors and confirmed that there is 12V at the plug heading down to the lambda probe, and something happening on the other side that changes with a blip of the throttle. Seems OK, but I can't remember what values I'm looking for there.
Anyway, is the problem likely to be something I did in cleaning the crankcase filter? If I hadn't replaced one of the hoses properly, could it let air into the exhaust and upset lambda value? If so, which hose is the likely culprit?