Bad oil sending unit??
Thread Starter
Senior Member
Joined: Jul 2010
Posts: 502
Likes: 0
From: Columbia, SC
Year: 2001
Model: Cherokee
Engine: 4.0 I6
Oil pressure is maxed out today on the way to work this morning. Also throwing a EVAP code. Would a bead sending unit throw that code?? Engine is running fine though, temp is good and running smooth.
CF Veteran
Joined: Aug 2011
Posts: 1,031
Likes: 4
From: Blue Springs, MO
Year: 1993
Model: Grand Cherokee
Engine: 4.0L Laredo
No, a bad sender won't cause any engine codes. They often leak or quit working properly, or both.
*An evap code is something else.. They can be caused by loose or leaking hoses or even just by opening the fuel cap with the engine running.
*Posting the exact code and what jeep you have might get you better answers.
*An evap code is something else.. They can be caused by loose or leaking hoses or even just by opening the fuel cap with the engine running.
*Posting the exact code and what jeep you have might get you better answers.
CF Veteran
Joined: Oct 2008
Posts: 2,127
Likes: 2
From: Hell, CA
Year: 1989
Model: Cherokee
Engine: 4.0L I6
Unplug oil sender wire, gauge should read zero.. ground it and it should go the other way. To verify oil pressure, run a mech. gauge. New sender is cheap enough.
CF Veteran




Joined: Nov 2010
Posts: 5,840
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
You have two problems.
The first is most likely the oil pressure sending unit. They often fail "high side" when they die. I recommend purchasing directly from Jeep for the best reliability/accuracy/mating with your factory gauge.
The second is the evap code. Post the EXACT code number here for comment. There are a lot of evap codes and the devil is definitely in the details with OBD codes.
The first is most likely the oil pressure sending unit. They often fail "high side" when they die. I recommend purchasing directly from Jeep for the best reliability/accuracy/mating with your factory gauge.
The second is the evap code. Post the EXACT code number here for comment. There are a lot of evap codes and the devil is definitely in the details with OBD codes.
Thread Starter
Senior Member
Joined: Jul 2010
Posts: 502
Likes: 0
From: Columbia, SC
Year: 2001
Model: Cherokee
Engine: 4.0 I6
Well it was pegged out for two days at 80psi but now its sitting anywhere between 45-65 on and off the gas. I recently did the 784 injector swap as well and everything is running great so I dont think that has anything to do with it. Changed my oil about a week ago........but i can do that with my eyes closed so I doubt anything went wrong there.....Just got rid of another EVAP code not too long ago but that ended up being the seal on the gas tank where the fuel lines go in, wiggling itself loose and almost collapsing inside the tank. Dropped the tank and took care of that but ill check that again anyway.
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