Thermostat OEM Honda or OEM Mazda

Always buy the Mazda OEM branded thermostat from any local or online Mazda factory parts retailer, this is not the item you want to save a couple bucks on, no matter how much you trust that ‘other’ brand.

Make sure you use a Mazda OEM thermostat. I wouldn’t trust anything but OEM for those.

I work at a Honda dealership in the mechanic field, and I would recommend the OEM thermostat, unless you have a rebuilt engine.

Stop using cheap thermostats. Get an oem honda unit and it will last and work correctly.

Your temp gauge is reading low because your mechanic is not using an OEM Honda thermostat. An OEM thermostat is designed specifically for your engine and the car will warm up quickly and the temp gauge will sit at the 50 yard line in any weather.

The Honda thermostat opened probably 50% more than the aftermarket, so lesson learned there.

Buy an OEM thermostat from Mazda. The aftermarket ones are sometimes not identical.

Car takes forever to warm up and seems to always be running rich, so I'm guessing either the thermostat or ECT, or both, is/are bad.

I have a 2015 sedan and I’ve got 192,000 km and owned it since brand new and I’ve had that happen and changed the thermostat twice, just make sure you get OEM Honda thermostat and coolant as it takes a certain type. Make sure you

Burp the cooling system of all air and make sure you add enough coolant to the radiator and overflow, it’s fairly common for the thermostats to fail

I just had the code P0126 on my 2021 mazda cx-30 with 20,000 miles. Seems to be the same issue