Hi , I'm having the same trouble as you had with emissions PO455. This has been going on for 3 years now and no one can find the problem. Do you know of a way I can reset the light. The emissions places are different one place failed me another passed me. I'm so confused. The shop I took it to checked it and said there was no leak. Emissions says it is. I have a 2002 jeep Gr. Cherokee.
Help
JoAnn
Dec 15, 2009 07:51 PM#2
Skatchkins wrote:Email Question:
Reset the light as in make it go away? Un hook the bat for a few hours. This will reset the comp. Or take it back to the shop and ask them to clear it.
Dec 15, 2009 08:04 PM#3
Pulled from the AllDataPro info:
SYMPTOM
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
TEST NOTE
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED.
WHEN MONITORED
Immediately after a cold start, with battery/ambient temperature between 40 °F and 90 °F and coolant temperature within 10 °F of battery/ambient.
SET CONDITION
If there is a leak larger than 0.080" in the evaporative system.
POSSIBLE CAUSES
* Leak at Gas Cap
* Vehicle History and Service Bulletin Investigation
* Visual and Physical Inspection
* Verify Evaporative Emission Leak
* EVAP Purge Solenoid Operation
* Intermittent LDP Monitor Failure
* Evaporative Emission Leak Detection
* Gas Cap
* LDP Component Leak
Dec 16, 2009 01:03 AM#4
for mine I reset the PCM right before I went in for the test. This made the light stay off for about 8 start up/ shutdowns