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Bunker Hill, WV
Other poss. may be coolant temp sensor. Can have both checked with a good scanner (not 'code reader') to verify function of both. Car should be checked after cooled down to ambient temp.
Any history of dead battery and trying to jump-start it?
when the car is in a crank-but no-start condition , turn the key to 'run' position and watch the check engine light and listen very carefully for a light click when the light goes out. try several times to verify. IF you do NOT here a click when the light goes out , then it's a good chance you have a failing 'main' relay. IF you do here a click , then you need to check further. Vehicle mileage and maint. history would be good info for us , to start.
if abnormal bob can fix it , then certainly a regular joe can!.............most mechanical (as in exhaust leaks) , will not get better over time , and yes eventually it will start affecting other systems (O2 sensor readings for one).
Does that model have a 'steering damper'? It would look like a shock absorber , mounted sideways with the steering linkage. If that's shot , it may allow excessive side to side wobble in the steering.
nevermind..................didn't read correctly.
What happens with the thermostat removed? GOOD circulation? If not then suspect water pump impellor is worn out.ANY possibility of incorrect thermostat installation?OR just defective? How are you purging the system ?
Diagnose the 'rich' condition , also.
Part of 'maintenance minder' system meant to remind you when and what recommended services are due by time or miles. Comes on when 'oil life' is at or below 15%.
May have individual(left/right) headlight fuses. Also check for good ground , if you have correct voltage to low-beam power wire.