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computer code p0455

Old 06-02-2010, 08:58 AM
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jeepmerunning's Avatar
Join Date: Feb 2010
Posts: 11
Model: Cherokee
Default computer code p0455

Check Engine Light came on for code p0455. I purchased a new gas cap from a Dealership but had no luck. It's ID'd as a Major EVAP leak. I found the green cap under the hood and hand tightened it. I followed the lines around the firewall to the driver's side of the engine and pushed the hoses tighter on the fittings. Fingers came out blackened (I think b/c of the charcoal canister?) Anyway, still have the CEL light. Could a faulty muffler cause this? Local shop wants $120 for a smoke test. It could be my fear of the light, but I think the Kee's performance is lacking now.

2001 Cherokee Sport 4WD. 96K miles.
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Old 06-02-2010, 09:03 AM
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93gc40's Avatar
Join Date: Mar 2009
Location: Visalia, Kalifornia, ussa
Posts: 2,750
Year: 1996
Model: Cherokee
Engine: 4.0

Black fingers are normal, if you touch anything in the engine bay. You C-Canister should be under neath by the fuel tank. Inspect all evaphoses for cracks. Is exhaust leaking or the intake.
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