Check Engine Light (P0128) - Coolant Thermostat - Page 3 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #21 of 37 (permalink) Old 02-19-2011, 09:02 AM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.

07 Silver Touring 5 door
1986 Mustang SVO 2.3L Turbo
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post #22 of 37 (permalink) Old 02-19-2011, 12:38 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=Bart link=topic=179467.msg3939545#msg3939545 date=1298124141]
[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.
[/quote]

How many miles do you have?

Angel Eyes, Advance timing, Fujita intake, Flex Inovations grounding kit, 2.0 Oil Conversion, triple guage pod, Glowshift oil pressure,fuel pressure, volts, AEM WideBand, vcts removal, LightWeight pullies, BSD Removal, TopSpeed Rear motor mount, HardRace Passanger Mount, TRZ Tranny Mount, vibrant header, vibrant exhuast, racing beat front sway bar+front endlinks,racing beat rear sway bar, Racing Beat Springs, TWM short throw shifter, EBC redstuff brake pads, Michelin Pilot Sport A/S Plus
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post #23 of 37 (permalink) Old 02-19-2011, 07:30 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=birdman579 link=topic=179467.msg3875384#msg3875384 date=1291529204]
My CEL had been coming on recently. I took it to the dealer and they pulled the same code and replaced the thermostat. They charged me $420. That seems a little high, but I was tired of dealing with it and didn't have a great way to get under my car. After 3 days everything seems good to go!

I hadn't noticed my car being slow to warm-up so I'll have to take note tomorrow morning.
[/quote]

I took my car for MD emissions testing yesterday and passed! My CEL hasn't come back on since the repair so it looks like the dealer did a good job.

04 Lava Mazda3s 4-door
5-speed, Leather, Sport, Xenons, Sunroof/6-CD, ABS/SAB/SAC, Auto mirror w/Homelink
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post #24 of 37 (permalink) Old 02-19-2011, 11:09 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

Just shy of 75,000 on my 2007.

[quote author=LuisDC link=topic=179467.msg3939611#msg3939611 date=1298137123]
[quote author=Bart link=topic=179467.msg3939545#msg3939545 date=1298124141]
[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.
[/quote]

How many miles do you have?
[/quote]

07 Silver Touring 5 door
1986 Mustang SVO 2.3L Turbo
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post #25 of 37 (permalink) Old 02-21-2011, 11:53 AM
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Location: Baltimore, MD
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Re: Check Engine Light (P0128) - Coolant Thermostat

Looks like I'll be replacing my thermostat, since while I was driving home from PA to MD yesterday, my CEL came on. After the diagnostic test, I found that it was this code. With 110,000 miles, I can't really complain.
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post #26 of 37 (permalink) Old 02-21-2011, 01:24 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=Bart link=topic=179467.msg3939875#msg3939875 date=1298174992]
Just shy of 75,000 on my 2007.

[quote author=LuisDC link=topic=179467.msg3939611#msg3939611 date=1298137123]
[quote author=Bart link=topic=179467.msg3939545#msg3939545 date=1298124141]
[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.
[/quote]

How many miles do you have?
[/quote]

A ok, thanks man, I am at 40,500miles so I have time.

Angel Eyes, Advance timing, Fujita intake, Flex Inovations grounding kit, 2.0 Oil Conversion, triple guage pod, Glowshift oil pressure,fuel pressure, volts, AEM WideBand, vcts removal, LightWeight pullies, BSD Removal, TopSpeed Rear motor mount, HardRace Passanger Mount, TRZ Tranny Mount, vibrant header, vibrant exhuast, racing beat front sway bar+front endlinks,racing beat rear sway bar, Racing Beat Springs, TWM short throw shifter, EBC redstuff brake pads, Michelin Pilot Sport A/S Plus
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post #27 of 37 (permalink) Old 02-21-2011, 02:35 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=LuisDC link=topic=179467.msg3940837#msg3940837 date=1298312641]
[quote author=Bart link=topic=179467.msg3939875#msg3939875 date=1298174992]
Just shy of 75,000 on my 2007.

[quote author=LuisDC link=topic=179467.msg3939611#msg3939611 date=1298137123]
[quote author=Bart link=topic=179467.msg3939545#msg3939545 date=1298124141]
[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.
[/quote]

How many miles do you have?
[/quote]

A ok, thanks man, I am at 40,500miles so I have time.


FYI: The hotter climates seem to cause the thermostat to die faster. My Milan 2.3L started to act up in the 40,000 mile range and my daughter’s started in the 50,000 mile range. She is in AZ and I am in Central CA.
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post #28 of 37 (permalink) Old 02-22-2011, 11:04 AM
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Re: Check Engine Light (P0128) - Coolant Thermostat

[quote author=Cross Bolt link=topic=179467.msg3940974#msg3940974 date=1298316907]
[quote author=LuisDC link=topic=179467.msg3940837#msg3940837 date=1298312641]
[quote author=Bart link=topic=179467.msg3939875#msg3939875 date=1298174992]
Just shy of 75,000 on my 2007.

[quote author=LuisDC link=topic=179467.msg3939611#msg3939611 date=1298137123]
[quote author=Bart link=topic=179467.msg3939545#msg3939545 date=1298124141]
[quote author=rdsanti89 link=topic=179467.msg3915205#msg3915205 date=1295922241]
What about the code P0126 (Insufficient Coolant Temperature for Stable Operation). Has anyone experienced this code?
[/quote]

I got this code myself after going down a 2-3 mile grade, but it reset itself after a couple of days of driving. I suspect the relatively long period of driving downhill, coupled with the high 30s outside air temperatures probably dropped the engine temp lower than what the computer expects, thus tripping the code. I had no driveability issues, engine warmed up normally on subsequent cold starts, and mileage was unaffected while the CEL was lit.
[/quote]

How many miles do you have?
[/quote]

A ok, thanks man, I am at 40,500miles so I have time.


FYI: The hotter climates seem to cause the thermostat to die faster. My Milan 2.3L started to act up in the 40,000 mile range and my daughter’s started in the 50,000 mile range. She is in AZ and I am in Central CA.
[/quote]

Damn.... I hope not yet.

Angel Eyes, Advance timing, Fujita intake, Flex Inovations grounding kit, 2.0 Oil Conversion, triple guage pod, Glowshift oil pressure,fuel pressure, volts, AEM WideBand, vcts removal, LightWeight pullies, BSD Removal, TopSpeed Rear motor mount, HardRace Passanger Mount, TRZ Tranny Mount, vibrant header, vibrant exhuast, racing beat front sway bar+front endlinks,racing beat rear sway bar, Racing Beat Springs, TWM short throw shifter, EBC redstuff brake pads, Michelin Pilot Sport A/S Plus
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post #29 of 37 (permalink) Old 02-22-2011, 12:37 PM
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Posts: 1,319
Re: Check Engine Light (P0128) - Coolant Thermostat

generally you get a p0128 when it takes too long to warm up,

and the P0126 codes comes up when the car is warmed up and then cools off too much after driving,

Like when the coolant temp goes below 160 deg f after it warmed up above that.

either way you need a thermostat.

So you have a fast______(your cars name here)????
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post #30 of 37 (permalink) Old 07-28-2011, 05:04 PM
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Re: Check Engine Light (P0128) - Coolant Thermostat

I just changed my thermostat and coolant yesterday and I've driven about 100 miles since doing it and the check engine light hasn't turned off. I read somewhere that its supposed to turn off but how long does it usually take?

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