OBD-II Generic Error Code P0037: How to Fix It

Q: What does code P0037 mean?

P0037 means the heater circuit in the downstream oxygen sensor (Bank 1 Sensor 2) has low voltage. This sensor monitors catalytic converter performance and needs heating to work properly.

Q: Can I drive with a P0037 code?

You can drive short distances, but the check engine light will be on, and your fuel economy and emissions may be affected. It's best to fix it soon to avoid potential damage to the catalytic converter.

Q: How much does it cost to fix P0037?

The cost varies depending on the root cause. A new oxygen sensor costs $50-$150, plus labor if you have a shop do it. DIY repair costs only the part and basic tools.

Q: Is P0037 the same as P0036?

No. P0036 refers to the heater circuit high voltage, while P0037 indicates low voltage. Both affect the same sensor but have different causes.

Q: Where is Bank 1 Sensor 2 located?

Bank 1 is the side of the engine with cylinder #1. Sensor 2 is downstream, after the catalytic converter. On most vehicles, it's under the car near the exhaust pipe after the converter.

Abstract

Error code P0037 indicates that the Engine Control Module (ECM) has detected a low voltage condition in the heater control circuit of the downstream oxygen sensor (Bank 1, Sensor 2). This sensor monitors the catalytic converter's efficiency and its heater helps the sensor reach operating temperature quickly. A low circuit voltage typically points to a faulty sensor, blown fuse, damaged wiring, or a poor electrical connection.