OBD-II Generic Error Code P2246: How to Fix It

Q: What does P2246 mean on my OBD-II scanner?

P2246 means the PCM detected a higher-than-expected reference voltage on the heated oxygen sensor (HO2S) circuit for Bank 1, Sensor 1 — the upstream oxygen sensor on the side of the engine that contains cylinder #1. This can be caused by a faulty sensor, damaged wiring, or in rare cases a PCM issue.

Q: Is it safe to drive with a P2246 code?

P2246 is a medium-severity code. While the car will likely still drive, you may experience reduced fuel economy and poor engine performance. Driving for extended periods with an oxygen sensor fault can cause unburned fuel to damage the catalytic converter, leading to a much more expensive repair. It is best to diagnose and fix the issue promptly.

Q: Where is Bank 1 Sensor 1 located on my vehicle?

Bank 1 refers to the side of the engine that contains cylinder number 1. On inline (4-cylinder) engines, there is only one bank, so the sensor is always on that engine. On V6 and V8 engines, Bank 1 is typically on the driver's side in most American-market vehicles, but this can vary by manufacturer. Sensor 1 is always the upstream oxygen sensor, located before the catalytic converter in the exhaust stream.

Q: Can a bad wiring harness cause P2246?

Yes. A damaged, chafed, or shorted wiring harness is one of the most common causes of P2246. The reference voltage wire running from the PCM to the oxygen sensor connector can short to a 12V power source, causing the PCM to read a voltage higher than expected. Always inspect and test the wiring before replacing the oxygen sensor.

Q: How much does it cost to fix error code P2246?

Costs vary depending on the root cause. A replacement upstream oxygen sensor typically costs between $20 and $100 for the part, plus 1-2 hours of labor if a shop installs it ($80–$200). Wiring repairs can range from minor connector cleaning at low cost to a full harness repair costing several hundred dollars. A PCM reflash at a dealership typically costs $100–$200. Overall repair costs commonly fall between $50 and $500 depending on the issue.

Abstract

Error code P2246 means the powertrain control module (PCM) has detected an abnormally high reference voltage on the Bank 1, Sensor 1 (upstream) heated oxygen sensor (HO2S) circuit. This typically points to a wiring fault, a faulty oxygen sensor, or a problem with the PCM reference voltage supply. Left unaddressed, it can cause poor fuel economy, rough running, and potential catalytic converter damage.