Fault phenomenon
    A 2008 annual production of BMW X5 car, models for the E70. Engine configuration for inline 6 cylinder N52, mileage 17688km. The user reflects the vehicle running in the engine failure warning lights will suddenly light up, and then has not extinguished, start the driving speed are more normal, this failure has been repaired in other service shops several times but did not solve.
    Troubleshooting and troubleshooting
    After receiving the car first understand the car from the failure to the current maintenance process. After the first failure after ISTA read fault code analysis is fuel quality failure, maintenance personnel that the fault light is likely to light and fuel quality have a certain relationship, the user said that each time in the regular gas station filling 97 Gasoline, because the quality of gasoline is difficult to identify the standard repair station, it is recommended that users pay attention to add high-quality gasoline. Delete the fault code, the instrument failure lights off, the DME programming after the test, the fault light is not lit again, to the user. Day 3 The vehicle came to the store to reflect the failure again, and stressed that it had changed another regular gas station to add gasoline. Connect the detector to read the fault code and the previous fault record, or the current fault does not exist. It seems that the problem is not as simple as the imagination, consider the ternary catalytic converter may be behind the two oxygen sensor or three-way catalytic converter is faulty, but theoretically unreasonable, due to take into account the second rework, so find To the same vehicle to the two three-way catalytic converter and the back of the two oxygen sensor with the transfer test, test drive nearly 100km failure did not occur, and then delivery.