My car has the check engine light on and so I scanned the car and got back a p0118 error code. I noticed you guys have a page about it and that a misdiagnosis can be bad coolant. my car often starts cold rough and runs the fan when still cold but then it turns off and wont really turn on once the car is warm even if I turn it off and back on. the check engine light pretty much stays on all the time. my temp gauge sits in the middle like it should and doesn't waver. I was wondering if these symptoms are more likely the coolant or the sensor or if there is no way to tell. also there seems to be two different coolant temp sensors mentioned on the internet, one that costs $80 and is a total pain to replace or a $20 part that you can replace without any real tools. Is it worth changing the coolent myself before getting the more expensive part changed since they will have to swap coolant anyway?
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