P1391 error code

[RubiconMan]

I was out in the desert this morning and suddenly I noticed the Check Engine Light was on. No performance issues, was able to go hill climbing with no issues, no rough idle or stalling. I used a scanner tool and the P1391 code came up. From what I have been reading on the web, this could be a cam or crankshaft sensor. Before I start switching them out, has anyone else had this problem?

Thanks in advance.

John

 

[Chris]

Yep, that's a camshaft or crankshaft position sensor.

This video might be worth watching:

Here's two threads worth reading as well:
Jeep TJ Wrangler Crankshaft Position Sensor Replacement
Jeep Wrangler TJ Camshaft Position Sensor Replacement

Should be easy and straight forward. Go with OE Mopar replacement sensors, as aftermarket ones are known to cause issues (no joke).

I also believe there is a procedure in the FSM to test each sensor to see which one is the culprit.

If you don't yet have a FSM, you can download them here for free:
Jeep Wrangler TJ Factory Service Manuals (FSM) & Technical Documentation

 

[RubiconMan]

Thanks for the links Chris.