Skip the auto shop - Our mechanics make house calls

Q: The thermostat has been replaced in my car twice in six months because the Service Engine Light keeps coming on

asked by on

when my car first ran hot I had the thermostat replaced a few months afterwards my service engine light came on again and went to autozone and it said replace thermostat...so mechanic thought something was wrong with thermostat so he took it out and replaced it...now two months later my engine light is on again saying replace thermostrat again....its has to be something else wrong

My car has 139000 miles.
My car has an automatic transmission.

A: The thermostats on this engine have an elec...

The thermostats on this engine have an electrical heater element intended to help the engine warm up faster. Many thermostat housings for this engine are plastic - from different suppliers. The plastic housings tend to leak around the heater wire plug, and corrode. Engine management "sees" the bad connection from corrosion to the thermostat heater as a failure, setting a problem code for 'replace the thermostat'.

Replace the thermostat with one with a metal housing, and the problem should go away. I would recommend having a thermostat replacement completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My engine fan is not kicking in, but my temp is between 80 -100. Is my thermostat bad because my check engine light just turned on

This can be caused by a number of things such a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at...

Q: Should I disconnect my battery?

This issue really depends on the amount of time the vehicle will be sitting. There are several other factors that will impact on the amount of time that the battery will hold a charge, but it really boils down to...

Q: Service engine error code P0401.

The light will not go away until the P0401 code is cleared from memory with a scanner. You should check the two heat resistant hoses that go to the DPFE sensor or the EGR sensor that goes down to the...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.