Fault phenomenon:
Lack of power in the vehicle, slow acceleration
Fault analysis:
The computer test shows fault code P029921. The relevant connecting pipes are checked and are normal. The pressure relief valve of the supercharger (professional name is air diversion converter) is further removed. It is found that the leather cup of the pressure relief valve is damaged. It is confirmed that the leather cup inside the pressure relief valve is aged, causing it to leak and the boost pressure is too low
Solution:
Replace the pressure relief valve
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