NewKindOfClown

OBDII P0455 - Evaporative Emission Control System Leak

I'm on an extension for my emissions test, and I need to get this taken care of. Clearing the code doesn't work; their system shows that it's been cleared, and then it comes back anyway.

Anyone know the cause? I do have an original factory gas cap.

NewKindOfClown

Alright, I searched. Just ordered a Stant gas cap on Amazon. It should be here next week, and I'll post the result.

tiwvr1

Y wait a week when u can get a gas cap anywhere? All the autoparts stores sell them. And if its not the gas cap, u might as well take it to a shop with a smoke machine, cause you are gonna run round in circles trying to find the leak.

NewKindOfClown

$5 for a cap from Amazon or $17 from the stealership. Didn't even think about a local store. Oh well, if the gas cap doesn't fix it, I'll be back to ask for help.

cpttuna

had same problem. two different new gas caps did not solve the problem. I had the smoke machine thing done also. the only trace of some smoke found was on a part on the rear firewall area(left side as you are looking at the engine compartment standing in front of the vehicle). I do not know the part name and looked in the junkyard but could not find one. I just reset the CEL. This last a day or two and the light comes back on.

NewKindOfClown

Like I said, I've been resetting it. It comes back after 2 or 3 days, and if I take it in for inspection before then, their system shows insufficient data. I'll wait for the gas cap and if it comes back on, I guess I'll try the smoke test.

tjwalker

There are a number of things that can be responsible for an evap. leak.

Trying a new gas cap is definitely the first thing to do. After that, inspect all vacuum hoses related to the evap system (around canister, solenoid, etc).

If you still can't resolve, spend the $100 or so to a shop that has the specialized equipment to perform the "smoke test".

Good luck!

NewKindOfClown

Just an update:
I cancelled my online order and picked one up locally for $11. It's been a few days with the new gas cap, and no CEL yet. I took it up for emissions testing today, but they're closed all weekend for the holiday. I guess I'll try again on a day off next week.

gary s

I had the same problem last year.No smoke machine so I put 5lbs of air on the service port.Closed the garage door and listened.Found a leak at the evap cannister in front of the rear axle.Then found one at the firewall next to the steering column.Hoses were cracked and leaked,seems that the newer hoses are cheaper,my '95 with 115K and '98 with 155K are fine,the '01 has 70K go figure

Mycherokee96

to reset the monitors, you have to put mileage on the car. ALL sorts. Not just getting on the highway and doing 65. You have to put anywhere between 50-100 miles depending on the car. Stop and go, and highway. Don't go over 55, they will set faster. Go about 60 miles, and before you bring it in for inspection, (I'm in NY) let it sit at idle for 10 min. DON"T SHUT IT OFF. Bring it to Autozone, or Napa, or whatever big chain your around, and let them check to see that your monitors are set. IF they are, bring it right in to be inspected. AGAIN DON"T SHUT IT OFF. Depending on what the code is, cycling the key will pop a code. I do this everyday, six days a week, for the past 10 yrs.....take it as you will...

NewKindOfClown

I drive 25 miles each way to work, 4-6 days a week. I was hoping their system wouldn't know the difference between 'no code' and 'no codes yet' but it did. I got the new gas cap, and it was clear for several days. Then I drilled a hole in the handle for a tether and realize I broke the seal. I'm gonna seal it with epoxy, reset it, and wait a few more days.

Mycherokee96

Pending codes will NOT cause you to fail an inspection.....

Mycherokee96

Oh, and yes.....I do own a 94 YJ.......lol

NewKindOfClown

Emissions test. P0455 is a big no-go. They told me to get it fixed.

Spunkmeyer

Have a smoke test done and save yourself a lot of headaches and time. It's probably the small rubber hoses at the rear evaporative canister near the rear axle on the drivers side (if your vehicle is like my '99.)