Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1992 Audi S4 2.2 PFACTORY OEM SERVICE PROCEDURE
WASTEGATE By-Pass Regulator Valve: Notes
NOTE:
The wastegate by-pass regulator valve is located in front of the exhaust gas turbocharger. The wastegate by-pass regulator valve regulates the control pressure of the blow-off valve, and in turn, the boost pressure. Whenever there is no current to the valve (e.g. disconnected connector), boost pressure is limited.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.