Code 1391 = An intermittant loss of CMP (crankshaft position sensor) or CKP (crankshaft position sensor. This code could be related to just a bad connection at either sensor or the wiring harness, check the connections and be sure they are clean and tight fitting with no loose wire connections also within the connector itself. Otherwise you may end up replacing one or both of theses sensors to correct this issue,unless you have an oscilloscope to isolate which sensor.
SOURCE: I have a 1999 jeep grand Cherokee larado V6.
The P1391 code indicates that the crank or cam sensor(s) have sent an intermitant code to the ecm. The most common cause for this is loose wiring or debris on the contacts of one of the sensors.
SOURCE: 2002 jeep grand cherokee with 4.0 engine will die but restart
p0340 is the cam shaft sensor, this will cause it to cut off while driving, hardtime starting, p0351 is the ignition coil A primary/secondary curcuit mal function. p1391 is ignition system misfire, this could be plugs, wires, or coils. first of all have the cam sensor changed and it may correct the rest of the codes. when fixed turn light off with obd2 scanner. if you do not have one, then any auto parts store will erase the codes fo free of charge.
SOURCE: 1999 jeep grand cherokee, error code 1494
hi im pete ill try and help code 1494 is fuel sending unit dection fuel pump ,<ldp>. pressure switch hope this helps
SOURCE: 1999 jeep grand cherokee. p0152, p0141, p0161
All 3 codes are point to the o2 sensor
the one you want to replace is on the exaust manifold looks like a spark plug with a wire sticking out of it un plug the sensor and it turns to the left to get off install the new one and plug the new sensor in
Thanks
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