Geely King Kong

I haven’t written a case for a long time. Today I will write a simple and error-prone man-made fault for everyone. It is a 2012 Geely King Kong 1.5 model.

Fault phenomenon:
The vehicle was transferred to the hospital. We only helped to solve the oxygen sensor fault. The other specific repair details and replacement parts were all described by the person who sent the vehicle for repair. Since the timing belt of this vehicle has not been replaced for a long time, the belt has aged and lost many teeth. After disassembling the cylinder head, the fault light was on for two or three days. The front oxygen sensor was reported to be unresponsive (Class E). After the fault was cleared, the fault still persisted after a few days of driving. The front oxygen sensor fault still persisted after replacement. The circuit measurement was normal, so I am looking for help.

Fault phenomenon
Fault analysis:
Since it is relatively simple and direct to share the inspection process and the cause of the fault,
First check the fault code, then wait for the water temperature to return to normal and check the front and rear oxygen sensor data streams. At this time, the front oxygen data changes very slowly, and the rear oxygen reacts faster than the front oxygen. Then open the hood for visual inspection. The plug and oxygen sensor are not damaged, and the front oxygen is also newly replaced. Here comes the key point. When checking the plug, it is found that the front and rear oxygen plugs are the same. Then unplug the front oxygen plug directly and find that the rear oxygen data stops changing, and the front oxygen is still active. The fault is clear, which is why there are three more faults in the fault code reading.

Fault analysis
Solution:
Man-made fault, caused by the wrong plug of the front and rear oxygen sensor plugs. The following picture is the fault code reported by the normal unplugging of the front oxygen sensor plug

Solution