i have a 97 cherokee sport 4.0 straight 6. my check engine light came on today. it was fine all morning and then i came back out after work and started it up and it was on. i ran the code and got the code of P0118 which is engine coolant temperature sensor circuit high. any idea how to fix this and clear the code out and what not. any thoughts

 

Wish I could help out on this one bud, but not too good with electrical. Bit if you do happen to find out what the issue is let us know.
Could use this for future reference

 

Dumb question i guess but u did not say did u replace the temp sensor yet?

 

Coolant temperature sensor is cheap and easy to replace. Unplug/unscrew old one, screw/plug in new one (I think you need teflon tape on the new one). They are around $13. Probably worth trying that before you spend time overthinking it.

 

i had this when i first got my jeep... i completly flushed the rad and the block because you have to take the t-stat housing off when u chane the t-stat anyway... replaced the temp sensor and thermostat and put prestone 50/50 in and the light went off. get a t-stat that opens at 160 it helps you run cooler

 

Either teflon tape or loctite. I've replaced one so far, usually fixes the problem.

Unplug your battery, replace the temp sensor, plug the battery back up. Should fix it no problem.

 

this is not recommended practice by the books and the cts I put it already had the locking compound on it

 

You don't really want to run cooler, you just don't want to overheat. Operating temperature is OK. Any functioning thermostat will be fully open before it boils. If somebody tells you water moving too fast won't pick up heat from the engine or register heat on the gauge, just smile, agree, and slowly back away.

 

160? I just about fell over.

 

I have a 160 t stat in mine. Reason is when i boight it it ran a bit over 210 and worried me so i put the 160 in and still runs a bit over 210 most the time so idk