P2298
O2 Sensor Out of Range During Deceleration (Bank 2 Sensor 1)
During engine deceleration with closed throttle (DFCO), the O2 sensor on bank 2 sensor 1 should swing fully lean as the manifold fills with fresh air. Code is set when the swing does not happen — usually a slow or coated sensor.
- 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.
- Sensor slow or coatedCommon
Parts involved
- Oxygen Sensor
P2298 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.