Question about 2003 Jeep Wrangler
Runs good engine lt on
Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
EVAP canister or fuel tank leaks
EVAP system hose leaking
Fuel tank leaking
Posted on Jan 12, 2015
If you have access to a simple vacuum gauge, hook it up to the purge valve (small hole) and disconnect the electrical connector of the purge valve. Start the engine and let it run for a while. If there is any increase in pressure, replace the valve. If there is no change in pressure, then it is another component of the EVAP system. Vent solenoid valve (check next using same procedure), purge solenoid valve (already checked), fuel tank pressure/vacuum sensor and a charcoal cannister. My next guess would be the charcoal cannister. The age of your car is nearly 10 years = 150k miles. Not sure how long the cannisters last, but surely not forever. The fuel tank pressure/vacuum sensor will throw an additional code after P0455. Good luck.
Posted on Apr 22, 2014
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Posted on Jan 02, 2017
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