OBD-II Generic Error Code P2220: How to Fix It

Q: What does P2220 mean on my vehicle?

P2220 means the Engine Control Module has detected a high voltage or abnormal resistance condition in the heater circuit of the NOx (nitrogen oxide) sensor located on Bank 2 of your engine. The heater is needed to bring the sensor up to operating temperature quickly; when it malfunctions, the sensor cannot accurately measure exhaust nitrogen oxide levels.

Q: Can I drive my car with a P2220 code?

In most cases you can drive short distances with a P2220 code, but it is not recommended for extended use. The vehicle may fail an emissions inspection, fuel economy can suffer, and on diesel vehicles with SCR systems a faulty NOx sensor can cause the system to default to a protective mode that reduces engine performance over time.

Q: How much does it cost to fix error code P2220?

If only a fuse or wiring repair is needed, the cost can be as low as $10–$50 in parts. A replacement NOx sensor typically costs between $100 and $400 depending on the vehicle make and model. With professional labor, expect a total repair cost of $200–$700. Luxury, European, and diesel vehicles with advanced NOx reduction systems tend to be at the higher end of that range.

Q: What is the difference between P2220 and P2200?

P2200 indicates a fault in the NOx sensor circuit on Bank 1, while P2220 indicates a fault specifically in the heater circuit of the NOx sensor on Bank 2. P2220 is specifically related to the heater element — which warms the sensor — rather than the sensing element itself. Both can cause emissions failures but may require testing different components.

Q: Will replacing the NOx sensor always fix P2220?

Not always. P2220 can be caused by a faulty sensor, but it can also be triggered by damaged wiring, a blown fuse, a bad relay, a poor ground connection, or in rare cases an ECM fault. Always test the wiring, fuses, and circuit voltages before replacing the sensor to avoid wasting money on a part that is not the root cause.

Abstract

Error code P2220 indicates that the Engine Control Module (ECM) has detected an abnormally high voltage or resistance in the heater circuit of the NOx (nitrogen oxide) sensor on Bank 2 — the side of the engine opposite cylinder #1. The NOx sensor heater must warm up the sensor quickly so it can accurately measure exhaust emissions; when this circuit reads too high, the ECM logs P2220 and may illuminate the Check Engine Light. Left unaddressed, a faulty NOx sensor heater can lead to failed emissions tests, reduced fuel economy, and potential damage to the catalytic converter or diesel particulate filter on equipped vehicles.