This Real Fix concerns a turbocharger issue on a fairly new Audi vehicle. The turbocharger recirculating valve is a known failure item on these vehicles, and will cause a noticeable lack of power and check engine light complaint.
The turbocharger recirculation valve is used to vent turbocharger boost pressure back into the intake manifold on deceleration, to prevent a build-up of boost pressure in the engine crankcase. Today’s Real Fix provides some diagnosis to help confirm a failed turbocharger recirculating valve.
2009, Audi A4 (Base), 2.0
P0299, Lack of Power, Replaced Turbocharger Recirculating Valve
The customer states that under hard acceleration, the vehicle lacks power and the check engine light comes on.
Connected a scan tool and found code P0299 – Turbocharger/Supercharger “A” Underboost Condition. Performed a road test and found there was a lack of power when the vehicle experienced boost pressure. Allowed the engine to return to room temperature, removed the connector for the turbocharger recirculating valve, and measured the internal resistance of the valve. The measured resistance was above the allowable specification of 8.6-18.6 ohms, which indicated the turbocharger recirculating valve was defective.
Replaced the turbocharger recirculating valve, cleared codes and performed a road test of the vehicle. The check engine light did not illuminate and no fault codes were found.
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