Fun with a P0455 Code

[gragravar]

last week my '04 discovery had the service engine soon light pop on. brought it to the dealer to check it out (still under warranty). they checked the gas cap and found it not sealing tightly. after replacing it, they pressure checked the system and found a leak detection pump was leaking and replaced it too. After a quick road test they declared all was good and sent me on my way.

Friday, the light popped on again. So, we're back at the dealer today to keep figuring this one out.

Oh well, rover is paying for it and for the loaner car.

I'll report back once I hear more and know more about whats causing this one.

[Wild Driver]

When you find out please post. I am working on the same code on my '99. I replaced the gas cap and about 180 miles later the light came back on. WTF?

[gragravar]

Originally Posted by Wild Driver

When you find out please post. I am working on the same code on my '99. I replaced the gas cap and about 180 miles later the light came back on. WTF?

will do. I should have the car back from them tomorrow with more information then. FWIW, my light only took about 30 miles to re-appear.

[gragravar]

update - the fixes before apparently fixed the P0455 code. the current check engine light is being caused by a P1000 unknown code. the dealer talked to land rover corporate who suggested an ECU re-flash. they have done this and are doing an extended drive test to be sure it doesnt recur. I should get the car back tomorrow. looks like one more day in the loaner.

[kkahao1]

I got the same code today. Have been noticing cap was bad. Going to replace. Let me know if you guys find out anything else.

[bugatti T35]

Hi,

I got the same code on my 2003 Disco. The gas cap seems fine. Is there any way to check it?
Also, where is the leak detection pump located and how to check that?

Thanks.

[bugatti T35]

Hi,

I checked my codes last night. The only one that came up was P0455.
The gas cap seems fine:wave. Can anyone advise how to test it?
Also I would like to know where the "leak detection pump" is and how to test it.

Thanks.

[bugatti T35]

Sorry, didn't mean to repeat myself, I thought my first post was lost in the "ether" when it didn't show up, now I see it!

Apologies.

[duckhunteryolo]

Welcome to the club, I have replaced my cap twice and mine is an '02. I think it is one of those sooner or later codes that will hit most Land Rover owners sad to say!

[antoinephillips]

I posted a similar response to another post:

Make sure when you tighten your gas cap after filling up that you tighten it at least 3 clicks. This solved the problem for me.

I posted a little more information about my specific circumstances with this code here if anyone is interested: Error code P0455

[k-rover1]

Just because it "seems" fine.. doesnt mean it is actually sealing properly.
I had this issue, the cap seemed fine, but once i replaced it. the check engine light went away

[loganpendergraft]

Purge valve. There's a Hyundai part that replaces it and is a lot cheaper than the Rover option. It fixed it when the gas cap wouldn't on my '01 Disco 2.