P055EOxygen Sensor Control Module System Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some engines use wide-band or NOx sensors with their own evaluation module that reports over CAN. That module measures its supply; outside its working range it sets P055E, and lambda control and the sensor diagnoses are suspended because no valid values exist. No manufacturer document available to us uses P055E – Ford's diesel monitors the comparable supply of its smart NOx/O2 sensor as P220A/P220B, below 8.5 V or above 16.5 V. CARB requires modules delivering emission-relevant signals to be monitored.
- What you may notice
- Check engine light on
- Lambda control in open loop, possibly higher consumption
- Further lambda or communication codes
- Likely causes
- LikelyFuse, relay or supply line to the sensor module
- PossiblePoor module ground
- PossibleBattery or alternator (under- or overvoltage)
- RareSensor module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.