OBD-II Error Code P0125: How to Fix It

Q: Can I drive with P0125 error code?

You can drive short distances, but the vehicle may have poor fuel economy, rough idle, and increased emissions. Avoid extended driving until the issue is resolved as it can damage the catalytic converter over time.

Q: What causes P0125 error code?

The most common causes are a stuck-open thermostat, faulty engine coolant temperature sensor, low coolant level, coolant leaks, or a malfunctioning radiator fan that runs constantly.

Q: How much does it cost to fix P0125?

Typical repair costs range from $150-400. A thermostat replacement usually costs $150-250, while a coolant temperature sensor replacement costs $100-200. Labor costs vary by location and vehicle complexity.

Q: Will P0125 cause my car to fail emissions?

Yes, P0125 will typically cause your vehicle to fail an emissions test because the engine isn't reaching proper operating temperature for optimal fuel control and catalytic converter function.

Abstract

Error code P0125 means your engine's coolant temperature isn't reaching the proper operating temperature for the fuel management system to switch to closed-loop mode. This typically indicates a problem with the thermostat, coolant temperature sensor, or cooling system that prevents the engine from warming up properly.