P2240
O2 Sensor Pumping Current Circuit (Bank 2 Sensor 1)
Bank 2 counterpart of P2237. The wide-band lambda sensor on bank 2 sensor 1 cannot operate its pumping current circuit.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Pumping current line open on bank 2Common
- Bank 2 wide-band sensor failedPossible
Parts involved
- Oxygen Sensor Wideband
- Oxygen Sensor Wiring
P2240 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.