What should I do if the Fox exhaust gas recirculation flow fails?

The following is an introduction about "What to do about the flow failure of Fox exhaust gas recirculation":

It is necessary to check the cause of the fault and then carry out maintenance. If the wastegate valve fails, check whether there is oil in the throttle valve. If the dipstick dips into the throttle and finds engine oil in the throttle, it means that the waste gas valve is broken and needs to be repaired. The waste gas valve is also the oil separator of the automobile. The pressure control valve is installed between the outlet of automobile compressor and the inlet of condenser to improve the heat transfer effect of condenser and evaporator through separation. The working principle is that the high-pressure gas from the compressor enters the guide vane in the waste gas valve, and the lubricating oil is separated from the gas by centrifugal force and gravity, so that the lubricating oil is discharged regularly and returned to the crankcase of the compressor, which can prevent the exhaust gas of the diesel engine from being directly discharged into the atmosphere. It plays an important role in automobile exhaust emissions, ensuring that automobile exhaust emissions meet national standards.