Check engine light reviews Code P0455.
SOURCE: P0455 check engine code
po455 is for aevap leak detected. the first common problem is a loosen or missing gas cap, there other most common is broken vaccum lines to the evap-system, heres a diagram to help you locate the lines to check,i circled where to start also try replacing gas cap if its not loose,also the purge valve is another part that goes bad if you start the truck cold you should hear and feel that valve running after a few minutes of engine running.hope this is helpful.
SOURCE: Check Engine Light - Code numbers P1486 & P0455
Found on my jeep that the high quality vac line to the evap bottle had split on the under side.
SOURCE: 2006 jeep wrangler check engine light came on it
There is a software update for the PCM that addresses this issue. TSB 18-028-06
SOURCE: 2002 jeep wrangler -- check engine light and code
P0302 means number two cylinder has a misfire, due to possibly a spark plug, spark plug wire, ignition coil, fuel injector or something mechanical in the engine like a bad valve, valve spring etc. Start at the front of the engine, where all the accessories are mounted(alternator, power steering pump, etc) then count each each spark plug from left to right in normal order. The cylinder to the left will be 1, and the cylinder to the far right will be 4. When you locate number 2 cylinder, check the plug wire for damage. remove the spark plug and inspect it for wear. A new set of spark plugs and wires will probably fix your problem. Otherwise it may me a coil pack or ignition module. Hope this helps.
SOURCE: code u1411 on jeep grand cherokee
Implausible fuel volume is the code,but it most likely was set from a bad ignition switch.It has to do with the malfunction of the switch,really setting a false code,and there might be another one also,but the ignition switch will correct the problem.
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