Car: 2002 Audi A4 2.0 Engine code: ALT Hi, I have a DTC and it says: 1 Fault Found: 17545 - Fuel Trim: Bank 1 (Add): System too Rich P1137 - 002 - Lower Limit Exceeded - Intermittent according to rosstech: Possible Causes * Mass Air Flow (MAF) Sensor faulty * Fuel Pressure Regulator faulty * Fuel Injector(s) faulty * Oxygen Sensor Control faulty o Oxygen Sensor(s) faulty * Evaporative Emission (EVAP) System faulty Possible Solutions * Check Mass Air Flow (MAF) Sensor * Check Fuel Pressure Regulator * Check Fuel Injector(s) * Check Oxygen Sensor Control o Check Oxygen Sensor(s) * Check Evaporative Emission (EVAP) System I reset the code approx. every week now noticed it comes on mostly at idle Also noticed that the crankcase breather hose hase a crack in it. Would this explain the DTC? Also poor acceleration.. Vacuum issue? Apart from that the car has no problems and has always been well serviced. Is it alot of work to replace that hose dealers over here (Amsterdam) charge me about 225euro for workmanship..