DME 7.8 DME 7.80 · A faulty flat-base tappet can be detected because the oxygen sen-

DME 7.8 DME 7.80 A faulty flat-base tappet can be detected because the oxygen sen- sor FR for this cylinder bank enriches the mixture (FR > 1) during acceleration with wide-open throttle see drawing below. Differ- ence from the other oxygen sensor > approx. 15 %. In the case of a fault, the flat-base tappets of the inlet valves for the entire cylinder bank must be replaced. A B A - Oxygen sensing, bank 1 B - Oxygen sensing, bank 2 1 - Select system test. 2 - Select "Request small lift". If "Valve lift diagnosis not ready" appears, a fault may have been stored. 1. Erase the fault memory. 3 - Activate the system test with the key F8 immediately before acceleration with wide-open throttle. The message "Drive link active" then appears. Note! If "Request small lift" appears, the valves remain at small lift, i.e. the performance is reduced dramatically. 0-122.9 page 2 2469 P1155 p1155 Printed in Germany – 6, 2002