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Model: 2014 Audi A7 Coupe. Driving mileage: 37282miles.   Issue: Multiple fault lights suddenly light up during driving, with ABS, tire pressure monitoring and air suspension all illuminated. The fault remains after the car is turned off and restarted.   Diagnosis: First, connect to VCDS and enter 03 detection, the fault code is 0365 of the right front wheel speed sensor, the fault code is shown in Figure 1.   Figure 1 Turn the right front wheel once the wheel is off the ground, and the wheel speed as well as forward and backward status can be displayed normally in...

  Model: CRH engine, 0BH transmission. Driving Mileage: 24,000 miles. Issue: The tire pressure light is on when the vehicle is driving. Diagnosis: the diagnostic instrument detects the vehicle fault code, ABS controller fault code: 01314 engine control unit, please read the fault code; engine control unit fault code: 00257 air quality sensor 1 signal is unreliable.  The circuit diagram of the air quality sensor G70 is shown in Figure 1.   Figure 1  SC15 powers the fuse for the air quality sensor, as shown in Figure 2.   Figure 2  Analysis of the cause of the failure:  Air quality...

  Model: A 2012 Jeep Wrangler off-road vehicle equipped with a 3.6L engine and matches the 722.6 electronically controlled 5-speed automatic transmission produced by Mercedes-Benz. The mileage is about 170,000km.  Issue: Cold car shifting delay, 2-3 gears, 3-4 gears have a serious lag phenomenon, sometimes the second or third gear will be locked after a long driving time, and the transmission ratio error of the second or third gear will be reported when the gear is locked. The fault code of the valve has been replaced with a new valve body in the previous maintenance.  Diagnosis: P0732 and P0733 are...

Model: 2016 Mercedes-Benz GLA200 (156.943), equipped with 270.910 engine and 724.001 transmission. Driving Mileage: 12,430 miles. Issue: The vehicle cannot be locked/unlocked using the remote-control key. Diagnosis: The customer reported that using the lock/unlock button on the remote-control key doesn’t lock/unlock the vehicle, and the same is true when using a different remote control key. However, the unlocking and locking switches in the car can be unlocked and locked normally. In this way, the hardware problem of the lock block can be quickly eliminated. But this car does have abnormal locking failures, so use a Mercedes-Benz special diagnostic instrument to...

Model: 2020 Audi A6L (C8), equipped with 2.0T DKWB engine and 0CK transmission. Driving Mileage: 6,308 miles.  Issue: After being parked for two days, the vehicle’s ignition switch cannot be turned on and the engine cannot be started. There is only one yellow warning light on the instrument cluster, as shown in Figure 1.  Figure 1  Diagnosis: At this time, because the ignition switch cannot be turned on, the diagnostic instrument cannot be accessed under normal conditions. It is necessary to manually input vehicle information, and then try to turn on the headlights or hazard warning lights to enter the...