Recently had the P0126 code on my 2006 Mzda3s with 180k miles. From what I can tell, I either need to replace the thermostat or the sensor. How am I to know which one to replace? I have seen something about temperatures and how quickly they should be reached but how do I check that?
With 180k I would replace the both. They are not expensive at all.
if you are going to install it yourself here is the instructions below
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