P0476moderate severityPowertrain
Exhaust Pressure Control Valve Range/Performance
on 2017 Audi S5 3.0L Supercharged V6 · AWD
What this code means
The exhaust pressure control valve signal is out of its expected range. The valve is not responding as commanded, affecting backpressure control.
Symptoms
- Check engine light on
- Loss of power
- Poor throttle response
Common causes
- Sticking exhaust pressure valve
- Carbon deposits in valve
- Wiring or sensor fault
- Failed valve actuator
Diagnostic steps
- Check valve position sensor readings
- Inspect valve for carbon buildup
- Test wiring continuity
- Replace valve if out of range
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