P2241
O2 Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
The pumping-current line of the wide-band oxygen sensor on bank 2, sensor 1 is below the lower threshold. Wide-band sensors use a small pumping current to keep their measuring cell at lambda 1; a low value usually means an open or shorted pump cell.
- 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.
- Pump cell open or sensor failedCommon
- Pumping current line shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Oxygen Sensor Upstream B2
- Oxygen Sensor Wiring
P2241 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.