Check Engine Light, No Code, "ECO" indicator stays off

NFRs2000NYC said:
I did...it was happening for a while, with no code, finally after a few cycles, the code appeared. P0520....bad oil pressure switch. Apparently very common on the 14s and 15s. Not a big deal, there is a TSB on it as well.

http://www.wk2jeeps.com/Misc/Cherokee/KL_TSB/KL_08_034_14a.pdf

If you check your oil pressure in your EVIC display, you'll see that it's pegged at 99psi.
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Well no luck there my oil pressure was still working. Damn this will be trip #5 for cel.
 
Late 2013 jku here
Same thing happened to mine. After reading -DONE- i still gat the cel light on..
I changed the air filter, since it was dirty as hell. 2 days later the light went off and never came back.
It also happened once I filled up at a crappy gas station. Bad fuel might of triggered something.
 
joedelalinea said:
Late 2013 jku here
Same thing happened to mine. After reading -DONE- i still gat the cel light on..
I changed the air filter, since it was dirty as hell. 2 days later the light went off and never came back.
It also happened once I filled up at a crappy gas station. Bad fuel might of triggered something.
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I would think air filter would have its own code or maybe mass air flow. But I appreciate the info.
 
Had a similar problem in my 15. Light came on, no code. Light went off. Drove for a while and it came back on. Same thing. Still no code.

Dealership took it in.

Ended up needing a new thermostat. Was intermittently sticking open and running cold.

Haven't had a problem since.
 
Dubzy said:
Had a similar problem in my 15. Light came on, no code. Light went off. Drove for a while and it came back on. Same thing. Still no code.

Dealership took it in.

Ended up needing a new thermostat. Was intermittently sticking open and running cold.

Haven't had a problem since.
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Just curious if you have had any other issues. As this is the 5th check engine light in 8 months.
 
No other issues. Just the thermostat. But CEL was on/off 3 times in about 2 weeks. Only acted up in colder weather.
 
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