What it means
During deceleration, the bank 2 sensor 1 oxygen sensor signal is outside the expected range. The code does not by itself identify whether the cause is the sensor, its circuit, or another engine condition.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 1 is the upstream oxygen sensor on the bank of cylinders opposite the one containing cylinder 1. The control module evaluates its exhaust-oxygen signal during deceleration, and P2298 sets when that signal falls outside the expected range for that condition.
Common causes
Most likely first.
- Aging or contaminated upstream oxygen sensor
- Exhaust leak near the sensor
- Wiring or connector fault
- Engine running unusually rich or lean
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Review freeze-frame data and confirm the code set during deceleration; compare Bank 2 Sensor 1 live data with fuel trims and the other available oxygen-sensor data.
- Inspect the Bank 2 Sensor 1 wiring and connector for heat damage, chafing, loose pins, or corrosion.
- Check the exhaust around the Bank 2 Sensor 1 bung and nearby joints for leaks that could draw in outside air.
- Check for rich or lean running using fuel-trim data and inspect for engine faults that could skew the upstream sensor reading.
- If the exhaust and engine checks pass, test Bank 2 Sensor 1 response and its circuit according to the manufacturer's procedure.
Common fixes
- Repair a leak near the Bank 2 Sensor 1 location.
- Repair damaged wiring or corroded connections to Bank 2 Sensor 1.
- Correct an engine condition causing persistently rich or lean exhaust.
- Replace Bank 2 Sensor 1 if it fails the specified response test.
Can I keep driving?
You can usually drive gently if the engine runs normally, but avoid prolonged driving if it is running rough or using noticeably more fuel. The fault can increase emissions and may lead to an emissions-test failure.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.