P2240: 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. 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.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines. Sensor 1 is the oxygen sensor before the catalytic converter.

Symptoms

• Check engine light
• Bank 2 lambda value stuck at 1.0 in live data
• Higher fuel consumption

Most likely causes

• Open pump-current wire or loose pin at the bank 2 sensor connector
• Bank 2 front sensor damaged by water or thermal shock
• PCM calibration that sets the code without a hardware fault (FCA 2025 Hurricane)

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the wiring and connector of the sensor indicated
2. Check the continuity of the wire between the component and the control module.
3. Look for exhaust leaks
4. Check the signal in live data with the engine warm
5. Check the fuse and the heater resistance if the code mentions it
6. Replace the sensor if it has power and does not respond

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P2240 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 2: Fuel injection
• 40: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2240?

Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.

What causes code P2240?

The most common causes are: open pump-current wire or loose pin at the bank 2 sensor connector; bank 2 front sensor damaged by water or thermal shock; pCM calibration that sets the code without a hardware fault (FCA 2025 Hurricane).

Related codes

• P2237O2 Sensor Positive Current Control Circuit/Open (Bank 1 Sensor 1)
• P2241O2 Sensor Positive Current Control Circuit Low (Bank 2 Sensor 1)
• P2242O2 Sensor Positive Current Control Circuit High (Bank 2 Sensor 1)
• P2247O2 Sensor Reference Voltage Circuit/Open (Bank 2 Sensor 1)
• P2254O2 Sensor Negative Current Control Circuit/Open (Bank 2 Sensor 1)
• P0154O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1

Sources

• newtonnet.co.uk: fordobd2012
• static.nhtsa.gov: MC 10074008 2280
• gsi.ext.gm.com: 2005file14
• static.nhtsa.gov: MC 11038312 0001

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.