P2242O2 Sensor Positive Current Control Circuit High (Bank 2 Sensor 1)
- 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
- P2242 flags the pump-current circuit of the bank 2 front wide-band sensor as too high, usually a short to the heater feed or battery voltage, or a signal locked at its midpoint although the mixture is being changed. No manufacturer publicly documents P2242 with thresholds. Saab describes the bank 1 version P2239 for its 2.0 turbo: 1.48-1.51 V held for 1 s while closed loop enriches the mixture. Ford's 2020-2023 summary routes any short to battery on a wide-band sensor wire to P0152 instead. CARB requires fuel-control sensors to be checked for wiring faults and implausible readings. P2240 is the open circuit, P2241 the low fault, P2239 the same fault on bank 1. Since a voltage short can kill a replacement sensor, the bank 2 harness should be checked first.
- What you may notice
- Check engine light
- Bank 2 lambda value stuck near 1.0
- Replacement sensor fails again if the short remains
- Likely causes
- LikelyBank 2 pump-current wire shorted to heater supply or battery voltage
- PossibleInternal short in the bank 2 wide-band sensor
- RareDamaged sensor interface in the ECM
- 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: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.