P2297
O2 Sensor Out of Range During Deceleration Bank 1 Sensor 1
Fuel & air metering (oxygen sensor)
Generic OBD-II
Medium
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.
Medium
Can I keep driving? Usually driveable — the engine runs, but fueling and emissions may be off, so fix it before an emissions test.
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?+
Short term, usually yes, but a faulty upstream sensor can hurt economy and emissions, so don't leave it long.
Can I just clear P2297?+
You can, but it returns within a few drive cycles unless the sensor, exhaust, or wiring is repaired.
Related codes
Often seen with P2297
Read & clear P2297 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX