OBD-II Generic Error Code P2298: How to Fix It

Q: What does P2298 mean on my OBD2 scanner?

P2298 means the powertrain control module (PCM) detected that the heated oxygen sensor on Bank 2, Sensor 1 — the upstream sensor on the exhaust bank without cylinder #1 — produced a signal that fell outside the expected range specifically during a deceleration event. It indicates the sensor is not responding as it should when fuel delivery is cut during coasting or engine braking.

Q: Is P2298 serious enough to stop driving my car?

P2298 is rated as medium severity. Your vehicle will likely still drive, but you may notice reduced fuel economy or a slight change in performance. Prolonged driving with this fault can potentially damage the catalytic converter due to improper fuel mixture management. It is best to diagnose and repair the issue within a few days to a couple of weeks rather than ignoring it indefinitely.

Q: How do I know which side is Bank 2 on my engine?

Bank 2 is the side of the engine that does NOT contain cylinder #1. On most inline 4-cylinder engines, there is only one bank, so P2298 is less common. On V6 and V8 engines, Bank 1 is the side with cylinder #1 and Bank 2 is the opposite side. Check your vehicle's service manual or a trusted online resource specific to your engine to confirm the correct Bank 2 location, as it varies by manufacturer and engine configuration.

Q: Can a bad oxygen sensor cause a failed emissions test?

Yes. A faulty upstream oxygen sensor can cause your vehicle to fail an emissions test in two ways: first, the check engine light being on is an automatic failure in most states, and second, an incorrect oxygen sensor signal leads to improper fuel mixture control which increases actual tailpipe emissions. Fixing P2298 and clearing the code is necessary, and the vehicle's readiness monitors must complete a full drive cycle before testing.

Q: How much does it cost to fix P2298 at a mechanic?

If the fix is simply replacing the Bank 2 Sensor 1 oxygen sensor, expect to pay roughly $150 to $350 at a shop, including parts and labor. If the fault is caused by wiring damage, a vacuum leak, or a deeper fuel system issue, diagnostic time and additional repairs can push the total higher. Doing it yourself with a quality replacement sensor and basic tools can reduce the cost to $50–$120 for parts alone.

Abstract

Error code P2298 means your vehicle's heated oxygen sensor (HO2S) on Bank 2, Sensor 1 is reading outside of its expected range specifically during deceleration events. This sensor is responsible for monitoring exhaust oxygen content before the catalytic converter on the side of the engine that does NOT contain cylinder #1. Left unaddressed, this fault can lead to poor fuel economy, failed emissions tests, and potential catalytic converter damage over time.