Mazda Mazda3 Problem Report
Mazda Mazda3 Check Engine Light/Trouble Code Due to Stuck Open Thermostat
Some vehicles may experience Check Engine Light illumination with a trouble code indicating the thermostat is stuck open. The thermostat will need to be replaced with a modified one and there is a software update for the Powertrain Control Module (PCM).
Check engine light came on during recent cold weather. Took car to Auto Zone to have error code read. Error code returned P0126 and P0128. Checked Internet forums and determine faulty thermostat was most likely the issue. Purchased new thermostat at Mazda dealership for $65.
Replaced part myself. Check engine light now off. - Visitor
Had to have the thermostat replaced 3 times in the past year and a half average bill for this is $500 nice to know Mazda is doing nothing about this problem - Visitor
We just keep clearing the code and it stays off till the next long trip I take. It throws code P0126. - Visitor
I just bought this vehicle and the engine light came on the day after I bought it!!! Autozone checked it out for me and the code directs us to the Thermostat!!! I noticed the timing belt is older so I will change it as well, the tensioner "pulley" is making a noice so I will take a look at it and hopefully with some grease I can get rid of the noice. I also notice a ratle on the driver's side front end which i'm guessing will be the shocks or maybe tie rod ends? - Visitor
Check engine light came on. The next day it was off, yet, I noticed the gauge showed that the car was overheating. Noticed coolant was low and battery had corrosion. The battery is new, so I didn't understand why this was happening. After taking my car to Hall, I was charged $69 for a diagnostic and was told it would cost $500 for a new thermostat, reprogramming, and antifreeze.x - Visitor
Just bought car used and 3 days later check engine light came on. Took to Advanced Auto for code details and was diagnosed as thermostat being stuck open so.... here I am at day 5. Planning to take car to be fixed which dealer will not stand behind. $200 later. - Visitor
Had a check engine light and mechanic said it was a stuck thermostat. - Visitor
Check engine came on. Pulled codes PO-128. Planning on replacing thermostat and coolant - Visitor
I replaced thermostat and coolant - Visitor
I have had this thermostat replaced 4 times within the same year, will i have to replace it again. It is getting quite annoying. - Visitor
replace thermostat - Visitor
Rich Fuel Fumes Inside the car After Few Moments Of Driving, Engine Lights Flashes, Misfires Will Not Stay Ceanck at stRT UP. HAVE NOT FOUND A SOLUTION AS OF YET. - Visitor
engine light for stuck thermostat - Visitor
Check engine light comes on. Mazda dealer says the thermostat needs replaced along with PCM update. $480. - jc67037
Engine light was on. Determined it was the thermostat stuck open. Thermostat had to be replaced. - Visitor
obd scanner showed this as the problem - Visitor
Check engine light came on with 3 codes and it was reset by the dealer. Advised to come back when the engine light comes on again which it did 4 months later. Dealer determined thermostat was stuck open and needed replacement. - Visitor
Haven't had it replaced yet as I don't want to spend the $250+ to fix it. The mechanic said it has no bearing on the operation of the car except for some fuel economy; I just need to pay for this before my car's next inspection. - georazz123
CEL has come on twice within the past year; both times code has related to thermostat stuck open. It went off on its own after about 2 weeks the last time, but has since come back on. I just called to get estimates...Dealership quotes $350 for parts & labor (!!), I have found a local mechanic who will do it for $165 labor and I can bring my own part, found the thermostat at Autozone online for $30. This is the route I will be going, and just hope it fixes the problem. - Visitor
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