Moin to everyone. I need your help. It’s a V70, Bj 2000, 170hp, BRC gas system I’ve been searching through the search function for hours, but still can’t find the error. How it all started: the moose continues to run clean and evenly, the sensed engine run has not changed. Sporadic the Mkl. only rarely, now constantly after about 5 – 10min drive. That caused me to read out the error memory. I use Torque. Not the yellow. The error P0171 is displayed when reading out the fault memory (sometimes also Missfire cylinder 5…is there a connection?). The error is immediately there after the deletion, even if the Mkl is “not yet” on. P0171 means mixture too thin. The error is timed no matter whether I drive on petrol or gas. Since both modes of operation produce the same error, I do not have to rely on the fuel / gas supply, – Already carried out: – air filters checked (almost new and clean) – vacuum hoses controlled at the air filter – air mass meters exchanged and contacts checked – spark plugs exchanged (were anyway on, even appearance) – ignition coils checked – Lambda probe changed – vacuum hose to the vacuum sensor and the hose of the tank ventilation to the intake bridge replaced. – All obvious points in the supply air system (except for the intake bridge itself) sprayed with brake cleaner when the engine is running, no speed change. – The concealment and cable of the coolant temperature sensor is checked (display in the dashboard is fixed at three o’clock). – Hidden at the two exhaust probes controlled. – Seal of the throttle valve controlled. – Once again sprayed with brake cleaner, now also the top of the intake bridge and injectors. I don’t really know any more at the moment. I h abe to have the injection nozzle switched to Zyl. 5 first time to get rid of maybe P0503. Next action would then be to take off the suction bridge. But that’s why I fear something back without any help. Does one of you have an idea how to proceed further? Greetings Thomas