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#3174140 - 10/31/13 04:45 PM My Mazda 3 got a first CEL
KrisZ Online   happy


Registered: 12/23/06
Posts: 4334
Loc: Toronto, Canada
Yup, it finally happened after 7.5 years and 110k miles. About two weeks ago my wife informed me that the CEL light came on. I disconnected the battery and the cel went away for over a week. Few days ago the cel came back and I knew that it must be coming on for a reason.
As my luck would have it, CT has a 50% off sale for their OBD2 scanner, so I got it for a $100 which is not bad considering it has few extra features such as data logging and ABS codes.
Anyway, the code is P1026 and it's insufficient coolant temp. which means I need a new thermostat. The car warms up as usual and the temp. needle always reaches the usual centre position. So there are no other indication of the thermostat being stuck open.

This brings me to another point. And it is about some members mantra of changing thermostats when certain mileage is reached. Well, in any modern car it is totally not needed because the car will detect longer warm up times far sooner that the driver looking at the dummy gauges. This pretty much removes all guess work and unneeded part changes. Neat if you ask me.


Edited by KrisZ (10/31/13 04:46 PM)
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#3174149 - 10/31/13 04:51 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Ndx Offline


Registered: 04/04/08
Posts: 1699
Loc: IL
Kris, If you will need some deeper diagnostics please let me know ...
I have hardware that does it on dealer level.

I'm in TO from time to time....

Good luck!


Edited by Ndx (10/31/13 04:53 PM)

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#3174204 - 10/31/13 06:01 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Char Baby Offline


Registered: 05/25/05
Posts: 7511
Loc: Rochester NY
I just PM'd you, as I just did a T-Stat in our daughters '06 mazda3.You may remember!


Edited by Char Baby (10/31/13 06:03 PM)
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#3174231 - 10/31/13 06:22 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Donald Offline


Registered: 03/21/04
Posts: 13667
Loc: Upstate NY
Originally Posted By: KrisZ
Yup, it finally happened after 7.5 years and 110k miles. About two weeks ago my wife informed me that the CEL light came on. I disconnected the battery and the cel went away for over a week. Few days ago the cel came back and I knew that it must be coming on for a reason.
As my luck would have it, CT has a 50% off sale for their OBD2 scanner, so I got it for a $100 which is not bad considering it has few extra features such as data logging and ABS codes.
Anyway, the code is P1026 and it's insufficient coolant temp. which means I need a new thermostat. The car warms up as usual and the temp. needle always reaches the usual centre position. So there are no other indication of the thermostat being stuck open.

This brings me to another point. And it is about some members mantra of changing thermostats when certain mileage is reached. Well, in any modern car it is totally not needed because the car will detect longer warm up times far sooner that the driver looking at the dummy gauges. This pretty much removes all guess work and unneeded part changes. Neat if you ask me.


There may be more than one temp sensor. I would verify that before changing the thermostat.

And some people consider a thermostat a maint. item and replace every 3-5 years. Its important for the engine to run at the designed temp. Rather than replace it only if it overheats or you get no heat in winter.
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#3174242 - 10/31/13 06:34 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
DBMaster Offline


Registered: 09/18/12
Posts: 2282
Loc: Greg Abbott Land
I used to replace the t-stat at every timing belt change on the old Accord (90-100K miles). Not a bad scheduled maintenance item, actually.

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#3174327 - 10/31/13 07:31 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
bdcardinal Offline


Registered: 06/03/05
Posts: 6682
Loc: Santa Barbara, CA
There might be another sensor, but 99.99% of the time it is the t-stat. The factory one comes with the housing, sensor and gasket all as one piece ready to put in. I sell a ton of these.
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#3174599 - 11/01/13 12:38 AM Re: My Mazda 3 got a first CEL [Re: bdcardinal]
ComfyShorts Offline


Registered: 04/26/10
Posts: 178
Loc: California
I've put a TON of thermostats into Mazda 3's to correct the same code. It seems like every other check engine light on a Mazda 3 that rolls into my bay is the P1026. Order from dealer and you'll get entire assembly, 30 minute job. Good idea to replace your serpentine belt and tensioner if needed, as both are coming off.

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#3174604 - 11/01/13 12:45 AM Re: My Mazda 3 got a first CEL [Re: KrisZ]
asiancivicmaniac Offline


Registered: 01/12/05
Posts: 4058
Loc: FL
They're a common thing on 3rd gen Miatas too.

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#3174694 - 11/01/13 06:30 AM Re: My Mazda 3 got a first CEL [Re: ComfyShorts]
KrisZ Online   happy


Registered: 12/23/06
Posts: 4334
Loc: Toronto, Canada
Originally Posted By: ComfyShorts
I've put a TON of thermostats into Mazda 3's to correct the same code. It seems like every other check engine light on a Mazda 3 that rolls into my bay is the P1026. Order from dealer and you'll get entire assembly, 30 minute job. Good idea to replace your serpentine belt and tensioner if needed, as both are coming off.


The serp. belt was changed last summer, however I think the tensioner has to be changed because it shifts slightly to the left under tension and it's not perfectly aligned, therefore I get a slight belt squeak when cold.
I think I'm going to leave this job for early spring and change the thermostat housing, the tensioner and drain and fill the coolant while I'm at it.

Also, I read somwhere on Mazda forums that the thermostat and the housing were revised several times over the past few year. Do you know if the new thermostat holds up longer? Did you have to change the revised one yet?
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#3174859 - 11/01/13 09:39 AM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Vikas Offline


Registered: 07/22/05
Posts: 8330
Loc: NorthEast
You have the scanner with the data logging. So you look at the live data to actually find the coolant temperature before deciding to buy a new thermostat.


Edited by Vikas (11/01/13 09:39 AM)

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#3175033 - 11/01/13 12:58 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
ComfyShorts Offline


Registered: 04/26/10
Posts: 178
Loc: California
Originally Posted By: KrisZ

Also, I read somwhere on Mazda forums that the thermostat and the housing were revised several times over the past few year. Do you know if the new thermostat holds up longer? Did you have to change the revised one yet?


I haven't had to replace a revised thermostat yet.

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#3195852 - 11/23/13 04:15 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
KrisZ Online   happy


Registered: 12/23/06
Posts: 4334
Loc: Toronto, Canada
Update:

I changed the thermostat this morning. Nothing really to report other than the job is not difficult, but a bit time consuming because of the location of the thermostat.
The new thermostat does look a bit different and better made, so let's hope it's the last one I change.

Here is the old one.


And the new one.

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