P0450low severityPowertrain
Evaporative Emission System Pressure Sensor/Switch Malfunction
on 2011 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
The PCM detected a fault with the EVAP pressure sensor or switch. This can prevent accurate monitoring of fuel vapor system pressure.
Symptoms
- Check engine light on
- Failed emissions test
- No driveability change
Common causes
- Faulty EVAP pressure sensor
- Wiring or connector fault
- Damaged fuel tank or vapor lines
- Failed PCM input circuit
Diagnostic steps
- Retrieve code and freeze frame
- Inspect pressure sensor wiring
- Test sensor signal and reference voltage
- Verify EVAP system integrity
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