After a 2008 Cayenne V8 accident vehicle was repaired, when the engine ignited, it felt that the engine was rotating without any resistance and could not start. Fault diagnosis: because the car is a long time placed accident maintenance car, for the 2008 Cayenne V8, it is equipped with valve lift control function, the valve hydraulic tappet is controlled by the oil pressure. Because the engine is not started for a long time, no oil can not make any pressure on the valve mechanism and then can not compress the point. Fire. Troubleshooting: no need to repair, only continuous ignition is required. After the oil pressure is set up, the system can start normally.