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What would you do, engine code for Thermostat? #5081037
04/20/19 06:26 PM
04/20/19 06:26 PM
Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Yuk Offline OP
Yuk  Offline OP

Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
2007 Mazda 6 2.3L 4 cylinder

Engine light came on after driving 25 minutes on the highway. Engine is running fine. As much as I can tell, fuel economy is normal.

Code indicates a problem with the thermostat. There is heat in the interior and the engine temperature remains normal.

Have now driven about 50-75 km since reseting the light. That car continues to run well.

Question:
Would you change the thermostat now, or wait for the car to show a code again?

Last edited by KittyTickler; 04/20/19 10:27 PM.
Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081044
04/20/19 06:32 PM
04/20/19 06:32 PM
Joined: Nov 2008
Posts: 13,600
NH
supton Offline
supton  Offline

Joined: Nov 2008
Posts: 13,600
NH
I'd get one of those ELM327 dongles, download Torq for my phone, and then see what temp the engine is running at. If not something for the smartphone then something that can read what the ECU thinks the engine is running at.

If the car is overdue for a coolant exchange, or you have other reason to touch the cooling system, then sure, mess with the t-stat. Otherwise I'd wait for the diagnostic tool and confirm it.


2011 Toyota Camry, base, 2.5L/6MT, 183k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 149k, ours
1999 Toyota Camry LE, 2.2L/4AT, 207k, his
Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081046
04/20/19 06:36 PM
04/20/19 06:36 PM
Joined: Sep 2005
Posts: 6,346
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,346
MIchigan
What Temp is it running ?

Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081055
04/20/19 06:39 PM
04/20/19 06:39 PM
Joined: Mar 2004
Posts: 22,224
Upstate NY
Donald Online content
Donald  Online Content

Joined: Mar 2004
Posts: 22,224
Upstate NY
The thermostat should be considered a maintenance item. I would replace it. It's cheap enough.

Has the coolant been changed recently?


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: What would you do, engine code for Thermostat? [Re: Warstud] #5081056
04/20/19 06:40 PM
04/20/19 06:40 PM
Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Yuk Offline OP
Yuk  Offline OP

Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Originally Posted by Warstud
What Temp is it running ?


Don't have an actual number, just a Hot/cold gauge. The needle has been sitting in the middle the whole time.

Last edited by Yuk; 04/20/19 06:43 PM.
Re: What would you do, engine code for Thermostat? [Re: Donald] #5081059
04/20/19 06:43 PM
04/20/19 06:43 PM
Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Yuk Offline OP
Yuk  Offline OP

Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
.
Originally Posted by Donald
The thermostat should be considered a maintenance item. I would replace it. It's cheap enough.

Has the coolant been changed recently?


Coolant was probably changed 3-4 years ago (approx. 50,000 km) with a 5 year mix.

Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081061
04/20/19 06:44 PM
04/20/19 06:44 PM
Joined: Mar 2004
Posts: 1,705
Flaherty, KY
92saturnsl2 Offline
92saturnsl2  Offline

Joined: Mar 2004
Posts: 1,705
Flaherty, KY
Which thermostat code is it? Not getting up to temp fast enough?

An ELM327 dongle is inexpensive and in minutes it will let you know if your problem is just a minor "taking too long to get to temp" which can probably be ignored if you need to or if it's something more serious like the temp running too hot or too cold for long periods of time. Many times a high or low temp won't show up on the temp gauge as most modern gauges are just glorified idiot lights (thank you Ford for starting that!) So you might be running 220F, which isn't overheating, but still hotter than the OEM intended and the gauge a lot of times won't reflect that. Same if the engine is running 160F, it's still technically "warmed up" and might show normal on the gauge, but that temp is too cold for the engine to run at peak efficiency.

I consider any coolant temperature problems to be semi-serious and would put thermostat replacement on my high priority to-do list if I were getting a thermostat code.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: What would you do, engine code for Thermostat? [Re: 92saturnsl2] #5081070
04/20/19 06:52 PM
04/20/19 06:52 PM
Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Yuk Offline OP
Yuk  Offline OP

Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Originally Posted by 92saturnsl2
Which thermostat code is it? Not getting up to temp fast enough?.....
I consider any coolant temperature problems to be semi-serious and would put thermostat replacement on my high priority to-do list if I were getting a thermostat code.


I didn't scan it, the neighbourhood shop diid, so I don't know.

I have the thermostat, so I can change it. Since the light hasn't come on again, I thought maybe I'd wait for a nicer day. It's a tight, knuckle scraping squeeze to get to the thermostat. Serp belt has to come off and the power steer pump has to come out. I'm probably just being lazy.

Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081078
04/20/19 07:01 PM
04/20/19 07:01 PM
Joined: Dec 2006
Posts: 8,560
Canuck living in California
KrisZ Online content
KrisZ  Online Content

Joined: Dec 2006
Posts: 8,560
Canuck living in California
I forget the code, but my Mazda 3 had the same thing, reaching temperature taking too long. I reset it and it came back after few days. The dummy temperature gauge was behaving normally. Change the thermostat. In rare cases it may be the temp. sensor, but most of the time this code is for the thermostat.

Last edited by KrisZ; 04/20/19 07:01 PM.

2015 Grand Caravan 3.6L - 31k miles.
2006 Mazda 3 2.0L - 171k miles
Re: What would you do, engine code for Thermostat? [Re: KrisZ] #5081086
04/20/19 07:06 PM
04/20/19 07:06 PM
Joined: Mar 2004
Posts: 1,705
Flaherty, KY
92saturnsl2 Offline
92saturnsl2  Offline

Joined: Mar 2004
Posts: 1,705
Flaherty, KY
Originally Posted by KrisZ
I forget the code, but my Mazda 3 had the same thing, reaching temperature taking too long. I reset it and it came back after few days. The dummy temperature gauge was behaving normally. Change the thermostat. In rare cases it may be the temp. sensor, but most of the time this code is for the thermostat.


If you have thermostat code and the gauge appears normal, 90% of the time it's the "taking too long to reach operating temp" code. Those can be safely ignored, but even though you might not notice it, emissions and fuel economy will suffer, the degree of which depends on how much longer the engine is taking to reach operating temp, if it's even reaching full operating temp at all.


1985 F-250HD 7.5L 4x4 135k- Castrol GTX 15w-40
04 Odyssey EX 190k Valv. Durablend 5w-30
96 Maxima GLE 265k Chevron Delo LE 5w-40
07 Chrysler Pacifica Limited 4.0L 140k Belgian Castrol Edge 0w-30 Euro
Re: What would you do, engine code for Thermostat? [Re: Yuk] #5081089
04/20/19 07:08 PM
04/20/19 07:08 PM
Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Yuk Offline OP
Yuk  Offline OP

Joined: Jun 2003
Posts: 873
Edmonton, AB Canada
Thanks! I'll change it.

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