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Model: F02, equipped with N52 engine. Driving mileage: 7659 miles.  Fault phenomenon: The left front door of BMW 730Li could neither be opened inside or outside, and the other three doors were kept unlocked and could be opened on both sides.  Diagnosis: There is no relevant fault record detected by the diagnostic instrument. When the car is locked with the car key, the four door locks do not respond, only the trunk and fuel tank cover can be locked, and there are double flashing warning signs. When unlocking with the car key, the 4 door locks do not respond, the...

Car: Porsche Model: Macan System: Engine Year model: 2020  Troubleshooting: Use a diagnostic instrument to detect the fault code in the PSM control unit (commonly known as ABS anti-lock braking system): 011D03 Mechanical failure of the right front wheel speed sensor, other control unit fault codes are the accompanying fault codes caused by the PSM system fault, and other faults when the instrument is on, the light is caused by a malfunction of the PSM.  The technician replaced the right front wheel speed sensor based on the previous maintenance experience, cleared the fault code, and tested the car. The customer...

Car: Cadillac Model: CT6 System: Engine Year model: 2020  Issue: The customer reported that recently the vehicle intermittently prompted a warning light indicating a reduction in engine power.  Fault diagnosis: Start the vehicle road test, after driving for a period of time, the engine fault light was on and the instrument prompted the fault information of engine power dropping. It was then verified that the problem described by the customer was true.  Check whether there are modified parts, etc. In this case, the vehicle did not have any modifications and program changes.  Connect the diagnostic device (GDS) to the vehicle...

Model: C8, equipped with DPMA engine and 0CK transmission. Driving mileage: 233 miles.  Issue: The customer reported that sometimes the fan will run automatically after the remote control opens the door or stops the car. The diagnostic instrument finds that there is a fault code "P069300 cooling fan actuation 2, short-circuit to ground" in the thermal management control unit J1024.  Troubleshooting: The car is a plug-in hybrid vehicle, the temperature of the air conditioner and engine as well as the temperature of the high voltage components and the cooling fan are controlled by the thermal management control unit J1024. Referring...

Brand: Mercedes-Benz Model: GLE350e System: Charging Year model: 2022 Issue: When the new car is in pre-delivery inspection (PDI), it is found that the instrument battery alarms, and the low-voltage power system cannot be charged.  Troubleshooting: This fault was discovered in the PDI of the new car, the low-voltage system could not be charged, the battery warning light is illuminated. The vehicle can be started, but it has been consuming power, up to -40A, and the high-voltage system is normal. No relevant DTCs were found in a quick test. Before diagnosing faults, we should first be familiar with the structural...