2002 Jeep Liberty: OBD code P0455 Detected?

Its a ECM scan Error code.Gets detected when vehicles computer is scanned.The code stored in vehicles computer.

As per details

The P0455  defines  "EVAP System Large Leak Detected" - very commonly, this can be a loose, missing or faulty Fuel Cap.
In some cases even putting fuel into the tank while the engine is running can set this code.
Sp first  make sure the cap is tight. Check the underside of the cap for any visible damage. If there are any doubts, replace the fuel cap. If the cap is known to be good, another common fail item associated with this code is the EVAP Purge Solenoid. Carefully inspect the vacuum lines to the solenoid for any cracks, holes, or loose/missing connections. The solenoid should also be tested for proper operation. If the solenoid checks ok, the best way to find a "leak" in the EVAP system, is to have the system "smoked". This is where a machine forces smoke throught the system, and the leak will reveal itself. Prices for this service vary from shop to shop, but it is the most efficient way, as chasing down a leak in the EVAP system can be very time consuming sometimes.

See the help diagram shown below:----




This details will help you .
Thanks.

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