Recent Topics
Michelin Tires?
by dslofti
11/23/14 12:42 PM
2011 quest CVT fluid change
by cronk
11/23/14 12:19 PM
Happy THanksgiving
by Jeffs2006EvoIX
11/23/14 11:50 AM
Picture of M1 High Mileage 5w-30 at work
by Oro_O
11/23/14 11:06 AM
Walmart Coupons
by Warstud
11/23/14 09:45 AM
Snow Shoe Info Needed
by larryinnewyork
11/23/14 07:13 AM
Article on antifreeze and pet poisoning
by schuylkill
11/23/14 06:43 AM
Carlson Hardware
by greasegunn
11/23/14 05:57 AM
Dang! Snowblower Wasn't in 2WD for Years
by ronbo
11/23/14 05:56 AM
Nokian WRG3
by Patman
11/23/14 05:43 AM
Non linearity in mixing VIIs
by Shannow
11/23/14 03:23 AM
PPPP 5W20 Test Results ?
by ChrisD46
11/23/14 03:13 AM
Newest Members
splatt, Lars65inc, dothedrew1202, dg370, Shuskey4
51982 Registered Users
Who's Online
81 registered (05LGTLtd, aa1986, alan003, AandPDan, 4wheeldog, 04SE, 10 invisible), 1836 Guests and 185 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51982 Members
66 Forums
222518 Topics
3521795 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3174140 - 10/31/13 04:45 PM My Mazda 3 got a first CEL
KrisZ Offline


Registered: 12/23/06
Posts: 4318
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)
_________________________
"I always thought I was perfect, until one time I thought I was wrong and it turned out I wasn't."

Top
#3174149 - 10/31/13 04:51 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Ndx Online   content


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)

Top
#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: 7494
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)
_________________________
"Finally Retired"!

1980 Firebird FORMULA V8-NEW
2001 Lexus RX-300 V6-NEW
2004 Nissan Altima 2.5S-NEW
2006 Mazda 3i 2.0L-PreOwned

Top
#3174231 - 10/31/13 06:22 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Donald Offline


Registered: 03/21/04
Posts: 13649
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.
_________________________
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1
Amsoil ATF in both vehicles & Magnefine filter.

Top
#3174242 - 10/31/13 06:34 PM Re: My Mazda 3 got a first CEL [Re: KrisZ]
DBMaster Offline


Registered: 09/18/12
Posts: 2256
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.

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


Registered: 06/03/05
Posts: 6678
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.
_________________________
2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter

NRA Endowment Member

"Fear disturbs your concentration."
-Sabine Schmitz

Top
#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.

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


Registered: 01/12/05
Posts: 4057
Loc: FL
They're a common thing on 3rd gen Miatas too.

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


Registered: 12/23/06
Posts: 4318
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?
_________________________
"I always thought I was perfect, until one time I thought I was wrong and it turned out I wasn't."

Top
#3174859 - 11/01/13 09:39 AM Re: My Mazda 3 got a first CEL [Re: KrisZ]
Vikas Offline


Registered: 07/22/05
Posts: 8317
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)

Top
#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.

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


Registered: 12/23/06
Posts: 4318
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.

_________________________
"I always thought I was perfect, until one time I thought I was wrong and it turned out I wasn't."

Top