P2041Reductant Injection Air Pressure Sensor A Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2041 catches an air pressure sensor A whose signal keeps dropping out or jumping for brief moments, too short or too irregular to be confirmed as a steady low or high fault. On trucks and machines with air-assisted DEF dosing this typically comes from vibration: a terminal with lost contact tension, a cracked wire inside the loom or moisture entering the connector at the dosing module. No manufacturer documents P2041 publicly; Deutz, which uses the same sensor slot, lists only the permanent electrical faults (P2037, P2039, P2040). CARB counts erratic signals among the circuit faults an OBD system must detect. Since the fault comes and goes, wiggle-testing the harness while watching live data is more useful than measuring at rest; replacing the sensor without that test often does not help.
- What you may notice
- Warning lamp coming and going
- DEF dosing interrupted at times
- Likely causes
- LikelyTerminal with lost contact tension at sensor or controller
- PossibleWire broken inside the insulation from vibration
- PossibleMoisture in the connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.