Problem Reports
Mazda 3
Report: Check Engine Light/Trouble Code Due to Stuck Open Thermostat
Mazda 3 Problem
Model Years Affected: 2004, 2005, 2008
Average Mileage: 94,714 mi (62,000 mi - 130,000 mi)
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).
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Report #1Visitor, 2004 Mazda 3, 62,000 mi
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Report #2Visitor, 2005 Mazda 3, 93,000 mi
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Report #3Visitor, 2005 Mazda 3
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Report #4Visitor, 2004 Mazda 3, 70,000 mi
Takes a long time to warm up.
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Report #5Visitor, 2004 Mazda 3, 106,000 mi
CEL code P0126
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Report #6Visitor, 2004 Mazda 3, 130,000 mi
We just keep clearing the code and it stays off till the next long trip I take. It throws code P0126.
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Report #7Visitor, 2008 Mazda 3
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
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Report #8Visitor, 2005 Mazda 3, 110,000 mi
Check engine light came on and repair shop says the Thermostat is stuck open and needs replaced. Estimate is a couple hundred bucks...Will see if I can do it myself...
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Report #9Visitor, 2004 Mazda 3, 92,000 mi
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.
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