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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EVAP connecting hose to PCV valve Collapse?

This problem is very common on many car models.
In this case the hose connecting between Evaporative Emission Canister Purge Solenoid Valve to the PCV valve PURGES.
Basically in most of cases replacing the hose resolves the problem,but in some cases the hose purges again n again still after replacing.Also car surge is noticed too.
If the hose collapses then it is not vacuum rated and it will not work. YOu need proper vacuum line.
Take care when you put the lines back on, you don't mix them up? Do it one for one swap .Because if you mix it up the system will pull fuel vapor all the time from the tank .
Also in some cases the evap sol valve and the pcv valve needs to be replaced/.

This will help.Thanks.

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