OBD-II Generic Error Code P2242: How to Fix It

Q: What does P2242 mean on my OBD2 scanner?

P2242 means the engine control module has detected that the heated oxygen sensor (HO2S) on Bank 2, Sensor 1 — the upstream sensor on the side of the engine opposite cylinder #1 — is outputting a pumping current signal that is higher than the expected range. This typically indicates a faulty wideband oxygen sensor, damaged wiring, or an exhaust leak near the sensor.

Q: Can I drive my car with a P2242 code?

P2242 is a medium-severity code. Your vehicle will likely continue to run, but fuel economy and emissions performance may be degraded as the ECM may alter fuel trims based on the bad sensor signal. Extended driving with this fault can potentially damage the catalytic converter. It is best to diagnose and repair it promptly rather than driving long distances with the code active.

Q: Is P2242 the same as a regular O2 sensor code?

P2242 is specific to wideband (also called air-fuel ratio or broadband) oxygen sensors used in many modern vehicles, rather than traditional narrowband sensors. Wideband sensors measure a broader range of oxygen content and use a pumping current to do so, which is why this code references 'pumping current high.' A standard narrowband O2 sensor will not produce P2242.

Q: How much does it cost to fix error code P2242?

If the fix is a replacement wideband oxygen sensor, parts typically range from $50 to $250 depending on the vehicle make and model. Labor at a repair shop generally adds $75 to $150. If the issue is a wiring repair, costs vary by the extent of damage. Total repair costs typically fall between $100 and $400 at a professional shop, but this can vary significantly by location and vehicle.

Q: Why does P2242 come back after I replaced the oxygen sensor?

If P2242 returns after sensor replacement, the most common reasons are: damaged or shorted wiring between the sensor and ECM that was not repaired, an exhaust leak introducing false air to the sensor location, a genuine rich or lean fuel condition caused by injectors or fuel pressure issues that is overwhelming the new sensor, or (rarely) an ECM fault. Using a scan tool to monitor live sensor data and fuel trims after replacement will help isolate the root cause.

Abstract

Error code P2242 indicates that the heated oxygen sensor (HO2S) on Bank 2, Sensor 1 is producing an abnormally high pumping current signal, which the engine control module (ECM) uses to measure exhaust oxygen levels. This code typically points to a faulty wideband oxygen sensor, wiring issues, or an exhaust leak near the sensor. If left unaddressed, it can cause poor fuel economy, failed emissions tests, and potential catalytic converter damage.