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1999 Jeep Cherokee Computer Code PO455

Tiny
MOPARSONLY
  • MEMBER
  • 1999 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
My 1999 Jeep Cherokee Sport's check engine light recently was tripped. After running the code check, PO455 was displayed-EVAP large leak detected. The first and obvious repair was to purchase and install a new gas cap. After installing the cap and several miles later. The check engine light shut itself off. Is this possible? Does the computer sense the correction in the EVAP system and clears itself? Or does the light normally click off after time (even if a correction was not made?) Should I plug in the diagnostic tool again to see if the code still appears, even though the check engine light is no longer illuminated? Appreciate your help.
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Wednesday, July 16th, 2008 AT 6:02 AM

1 Reply

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Yes, the check engine light can turn itself off usually take several hundred miles, that why better to have codes cleared. Iwould run another diagnostic.

Does you check engine light come on temperarily when you start the vehicle? Possible the bulb burned out if not.
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Wednesday, July 16th, 2008 AT 6:59 AM

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