O2 Sensor Out of Range During Deceleration Bank 1 Sensor 1
What it means
P2297 means the upstream oxygen sensor on bank 1 read an implausible value during deceleration, when the ECM cuts fuel and expects the exhaust to go lean. A reading outside the expected range points to a worn or contaminated sensor, an exhaust leak, or a wiring problem. The car will usually still drive, but fueling accuracy and emissions can suffer until it's fixed.
Can I keep driving? Usually driveable — the engine runs, but fueling and emissions may be off, so fix it before an emissions test.
Real-world scan data
Appears alongside · share of P2297 scans
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Possible rough running or hesitation
- Reduced fuel economy
- Failed emissions test
Common causes
Most likely first
- Aged or contaminated upstream oxygen sensor (bank 1, sensor 1)Likely
- Exhaust leak near the sensorCommon
- Damaged wiring or a poor connector at the sensorCommon
- Vacuum leak or unmetered air affecting the mixtureLess often
- Fuel pressure or delivery problemLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and watch the sensor's response during deceleration (fuel cut-off).
- Inspect for exhaust leaks ahead of the sensor and check the connector and wiring.
- Check for vacuum leaks and confirm fuel pressure is in range.
- Replace the upstream oxygen sensor if it stays out of range after the above.
- Clear the code and re-test over a full drive cycle.
FAQ
Quick answers
Is it safe to drive with P2297?+
Can I just clear P2297?+
Related codes
Read & clear P2297 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.