2003 Toyota Camry Coolant Temp Code

Suggested Repair

Start with a coolant flush and thermostat replacement rather than the more expensive coolant temperature sensor. A flush was already done and the light returned after a few days, so replace the thermostat next. Also check for cooling-system leaks, especially at the water pump and radiator cap, and bleed air while refilling.

Conversation Summary

The owner of a 2003 Toyota Camry LE has a check engine light for coolant temperature below the normal thermostat level. Mechanics separately suggested a radiator flush, sensor replacement, or thermostat replacement, while the dealer recommended all three. An expert advised flushing the coolant and replacing the thermostat first because the sensor is more expensive, and asked about warranty. The owner said a flush had already been done and the light returned after about three days; with about 65,000 highway miles, warranty coverage was unlikely. Another owner suggested checking for leaks at the water pump and radiator cap and bleeding air from the system.