P0454low severityPowertrain
Evaporative Emission System Pressure Sensor/Switch Intermittent
on 2017 Audi S5 3.0L Supercharged V6 · AWD
What this code means
The EVAP pressure sensor signal is dropping out or spiking intermittently. This usually points to a loose connection or a failing sensor rather than a steady fault.
Symptoms
- Check engine light on
- Intermittent EVAP-related codes
- No noticeable drivability issue
Common causes
- Loose or corroded sensor connector
- Faulty EVAP pressure sensor
- Damaged wiring to sensor
- Intermittent PCM ground fault
Diagnostic steps
- Inspect EVAP pressure sensor connector and pins
- Wiggle-test wiring while monitoring live data
- Check sensor voltage against spec
- Replace sensor if signal drops out
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