P2414
O2 Sensor Exhaust Sample Error Bank 1 Sensor 1
Fuel & air metering (oxygen sensor)
Generic OBD-II
Medium
What it means
P2414 means the upstream oxygen sensor on bank 1 (before the catalytic converter) is not getting a proper exhaust sample, so its readings are unreliable. Because this sensor controls the fuel mixture, the engine can idle rough, surge, or use more fuel. Common causes are a failing sensor, damaged wiring or connector, or an exhaust leak near the sensor letting in outside air.
Medium
Can I keep driving? Usually yes, but the upstream sensor drives fuel trim, so you may notice rough idle, surging, or poorer economy until it is fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or unstable idle
- Engine surge or hesitation
- Higher fuel consumption
Common causes
Most likely first
- Faulty upstream oxygen sensor (bank 1, sensor 1)Likely
- Open, shorted, or corroded wiring or connector at the sensorCommon
- Exhaust leak near the sensor drawing in outside airCommon
- Sensor contaminated by oil, coolant, or moistureLess often
- Poor sample flow from a plugged sensor port or damaged bungLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is bank 1, sensor 1 (upstream, on the bank with cylinder 1).
- Inspect the sensor's wiring and connector for damage, corrosion, or a loose pin.
- Check for exhaust leaks near the sensor and repair them first.
- Compare the sensor's live signal against a known-good sensor; replace it if it fails to switch correctly.
- Clear the code and re-test over a full drive cycle.
FAQ
Quick answers
Is it safe to drive with P2414?+
Short-term yes, but because this upstream sensor controls fuel mixture, leaving it can hurt economy and, over time, the catalytic converter. Fix it soon.
Can I just clear P2414?+
It returns within a few drive cycles unless the sensor, its wiring, or a nearby exhaust leak is actually repaired.
Related codes
Often seen with P2414
Read & clear P2414 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