P2240 code meaning
O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)
Powertrain system Generic code P22xx codes Check engine light
What P2240 means
P2240 is the open pump-current circuit of the front wide-band sensor on bank 2, so it only exists on V engines and boxers. Ford's summaries (2012 and 2020-2023) introduced it to replace P0154; detection works as on bank 1, by lambda failing to react to reference-current pulses or by the NTK interface chip. VW's 2014 Touareg and CC books flag 1.49-1.51 V combined with a lambda controller offset above 0.07 or a controller at its limit. GM's 2005 V6 adds a fuel cut-off test (signal below 1.7 V for 2 s). FCA reflashes the PCM for P2240 on the 2025 Ram 1500 and Wagoneer with the 3.0 Hurricane (bulletins 18-071-26, 18-082/083-26), and Jaguar Land Rover lists it among the 3.0 V6 sensor faults caused by water shock.
P2240 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2240
- Check engine light
- Bank 2 lambda value stuck at 1.0 in live data
- Higher fuel consumption
Common causes of P2240
- Most likelyOpen pump-current wire or loose pin at the bank 2 sensor connector
- PossibleBank 2 front sensor damaged by water or thermal shock
- Less likelyPCM calibration that sets the code without a hardware fault (FCA 2025 Hurricane)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor1Oxygen sensor wiringECM
What each part of P2240 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 40 | The exact fault in that area. |
What to do next
- Note P2240 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2240
What does P2240 mean?
P2240 means "O2 Sensor Positive Current Control Circuit/Open (Bank 2 Sensor 1)". P2240 is the open pump-current circuit of the front wide-band sensor on bank 2, so it only exists on V engines and boxers. It is a generic code, so it means the same on every make.
Is it safe to drive with P2240?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2240 fail an emissions test?
Yes, it can. P2240 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2240 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2240 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.