Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
I'd suggest to trace the coolant sensor wiring back to the ECU and check it for insulation damage and corroded connections as you go
if this is OK then also check the air filter isn't clogged and also check for exhaust leaks before the O2 sensor as if this has been experiencing an exhaust leak then it will have been running very rich as the sensor will see the extra air pulled in as fresh / lean fuelling and be adding fuel to compensate.
this can lead to catalyst failure as the extra fuel can re-light inside and melt the catalyst
The best way to find an exhaust leak is to run the engine from cold and feel around the exhaust joints with your bare hands - you'll have about 30 seconds before it all gets too hot and you should feel any escaping gas blowing over your fingers
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