P2A50Alternative Fuel Vaporizer A Outlet Temperature Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A vaporizer, often called reducer or converter on LPG systems, turns liquid gas into vapour with heat taken from the engine coolant. The sensor in P2A50 sits on the outlet side of vaporizer A and tells the control unit whether that unit is warm enough. Patent US7073489B2 explains why this matters: with too little heat the liquid does not fully evaporate and can block the regulator jet. P2A50 covers any fault in this sensor circuit that the module cannot classify as low or high. No vehicle manufacturer documents P2A50 publicly; aftermarket controllers such as AC STAG show the same problem as a missing or shorted reducer temperature sensor. Until the circuit works again, the system will usually stay on or return to petrol.
- What you may notice
- Check engine light, depending on calibration
- Vehicle stays on petrol or switches back from gas
- Gas mode indicator flashes or stays off
- Likely causes
- LikelyPlug or wiring of the vaporizer A outlet sensor faulty
- PossibleOutlet temperature sensor of vaporizer A defective
- RareInput stage of the gas control module disturbed
- 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: €80 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.