DME 7.8 DME 7.8 0 · 0-36.2P0171

DME 7.8 DME 7.8 0 0-36.2P0171 Oxygen Sensing Adaptation, Idle Range, Bank 1 – Above Limit Diagnosis conditions • Oxygen sensing system active • Time elapsed after engine start-up: 250 to 350 seconds (USA) • Time elapsed after engine start-up: 302 to 402 seconds (RoW) • Engine temperature greater than 60 °C Possible fault cause ♦Incorrect signal from MAF sensor ♦Intake air system leaking ♦Fuel pressure too low ♦Volume supply of fuel pump too low ♦Fuel injectors fouled ♦PCV valve leaks ♦Cap of oil filler neck not closed correctly or seal is damaged Affected terminals - Diagnosis/Troubleshooting Note! ♦Air leaks ahead of the oxygen sensors can lead to a fault in adaptation Check exhaust system for leaks. ♦Contrary adaptation values in connection with misfiring point to incorrectly adjusted control times check con- trol times and adjust if necessary. ♦If the fuel tank reserve light is switched on, no fault is entered. Work instruction Display OK If not OK 1 Close cap of oil filler neck properly or replace the seal 2469 P0171 0-36.2 page 1 Printed in Germany – 6, 2002 p0171