P0403 is a failed EGR solenoid. P1391 is intermittent loss of cam or crank sensor.
Trouble code P1391 means: Intermittent loss of CMP or CKP
Loss of Camshaft or Crankshaft sensor read at the PCM.
Either the cam or crank sensor could have failed.
Trouble code P1391 means:Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP
P1391 p1392 are codes that mean rough road and performance, I had theses codes on my 96 trooper and I replaced the front brake pads cause 1 caliper was not releasing and causing drag also greased universal joints and it stopped the vibration that puzzled me to extreme . This is what I did to fix the problem I had maybe this will help you as it can be numerous of things
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P1391 means: Intermittent loss of CMP or CKP