Brake Switch B Circuit and Insufficient Coolant temperature for stable operation code

[TitanVintaStang]

I'm not sure about the brake code because I just fixed that a couple weeks ago, and this code along with the coolant temp code as well at the same time. I read up on the coolant temp code that it's possible it's the thermostat. Anyone else have any experience with these?

 

[Davicho]

Definately the thermostat. Mine threw that same code about 3 weeks ago. Had my thermostat replaced along with a whole gallon of FL22 coolant and code has not came back. Replace your thermostat.

 

[TitanVintaStang]

Thanks D. Did you replace it with an OEM or just a good ol' Autozone bought thermostat? I read some people recommended OEM but I've always used parts from Autozone with no issues.

 

[Davicho]

I replaced mine with a Motorcraft unit which is OEM for Ford. I tend to stay away from aftermarket if possible. Plus I work at a dealership so I get OEM stuff pretty cheap. You can use the Motorcraft thermostat it will bolt right up too. Part #RT-1193 don't forget to pick up a gallon of Mazda's FL22 coolant. I did use OEM coolant. Part# 0000-77-508E-20

 

[TitanVintaStang]

Thanks. I always used and never had issues with Duralast products. What about the coolant? Is it necessary to use that certain one?

 

[Davicho]

I was going to use a regular long life coolant, but my good friend who is a tech at Mazda highly reccomended that I didn't use anything else other then Mazda's FL22 coolant because of the special formulation for the cooling system. I don't know for sure but the FL22 was almost the same in price as the aftermarket so I just went with OEM coolant.

 

[TitanVintaStang]

Well, I bought the thermostat from Autozone and the FL22 coolant. Just when I was about to replace the thermostat, I decided to disconnect the battery for the heck of it and put it back on. All of a sudden, all the codes disappeared. I can understand the brake switch code being gone just because I replaced it and didn't reset the ecu. But the thermostat code??? Possible just a loose plug to the sensor?? I'm code-free now and I spend all that money. LOL

 

[Davicho]

No you should still replace the thermostat and coolant. All you did is reset the ECU so it cleared the codes but they will come back eventually. That's one method of resetting a CEL (check engine light) if you don't have an OBD scanner.

 

[flcruising]

Yea, don't ignore a coolant temp DTC. Resetting the PCM doesn't fix anything.

 

[TitanVintaStang]

Well, both problems are fixed now. Reset the computer, thermostat changed, and now it's codeless and fan is working great. SUPER quiet fan too.

It was a b**** to reach my hand under to take the bolt out though. Got a lot of love scratches on my arms from the car.

 

[churrosurf]

2007 Mazda 5 sport.I just got the check engine light on, went to Autozone, and the error code is PO126 , low coolant level, open or short circuit condition, Faulty ECT sensor. Any advice on this, somebody had the same error? thanks.

 

[was98strat]

2007 Mazda 5 sport.I just got the check engine light on, went to Autozone, and the error code is PO126 , low coolant level, open or short circuit condition, Faulty ECT sensor. Any advice on this, somebody had the same error? thanks.

Actually a P0126 is "insufficient coolant temperature for stable operation..." your thermostat likely needs to be replaced. I'm assuming that you've checked and aren't using coolant (that's a different problem) replacing the thermostat is a $350-400 repair. I just had mine done this past fall (2006 Mazda5 GT)

 

[kw_da]

See http://www.mazdas247.com/forum/showthread.php?123805176-Mazda5-with-CEL-P1026-amp-Thermostat-Replacement.

I had same problem - you can replace yourself with a bit of work. OEM thermostat ~$60 if I remember correctly - comes with housing.

Good luck

2007 Mazda 5 sport.I just got the check engine light on, went to Autozone, and the error code is PO126 , low coolant level, open or short circuit condition, Faulty ECT sensor. Any advice on this, somebody had the same error? thanks.

 

[was98strat]

See http://www.mazdas247.com/forum/showthread.php?123805176-Mazda5-with-CEL-P1026-amp-Thermostat-Replacement.

I had same problem - you can replace yourself with a bit of work. OEM thermostat ~$60 if I remember correctly - comes with housing.

Good luck

Man, where is your dealership?? OEM thermostat where I am is $120!!!

 

[kw_da]

I bought online- can't remember exactly where - but here is a reference for ~$50 -

http://www.mazdaparts.org/mazda-3-thermostat.html

if you buy $100 - free shipping in the states. Looks like you're in Canada - probably different prices.

Good Luck

Man, where is your dealership?? OEM thermostat where I am is $120!!!

 

[was98strat]

yep, I'm in canada and we get ***** for pricing on just about everything!!