whitetigerkiller

Hi Rx8 owners.

I just found this forum, I own a 2004 rx8 GT 6 sp has a little over 20k miles on it

I came to this problem... so here it is.
CEL came on about 2 weeks ago.
went to advance auto part, ran the thing
It came out to be "Evap emission control system leak very small. p0456"
I figure it might be a gas cap. (like my friends told me)
I tighten it up, it didnt go away (friends told me it takes a while to make it go away)
So I just went to advanced auto part and have it cleared.

It was gone for about a week, It came back on again!!!
I went to advanced auto part, some reason their detector thing was broken...
so I couldn't figure out why the light is up again.

1. Evap emission control system leak very small, p0456. Is this a common CEL for rx8 owners?

2. Is this a serious problem? it said "very small" Should I stop driving?
Can I kinda ignore this CEL?

3. How long does CEL to go away if it was "gas cap" I heard 20-30 driving cycle?

4. Is this under powertain warranty?

5. what do you recommend me to do ? I heard Mazda is very expensive to just diagnose the problem...


Thank you very much.

Renesis07

iTrader: (1)

disconnect your battery for an hour, it will reset the cel

Jedi54

iTrader: (7)

Mazda will diagnose for free under warranty. If it's a small evap leak, they'll probalby just clear the code themselves and send you on your way.
disconnecting the battery is one way to get rid of the CEL.

If it comes back again, you might want to have Mazda replace the gas cap.

On a side note: not all auto part stores have Code readers who can pick up all the RX-8 codes.

Welcome to the club!

fahrfegneugen

I did it and it only takes a sec. once the power is out of the computer, that kind of memory is lost.

If you do that you will have to reset the DSC, there are instructions in the owners manual.

whitetigerkiller

thanks for kind words for everyone who applied

hey jedi, i only have powertain warranty, so this should be under warranty still?

fahrfegneugen

^no but they may be nice

Renesis07

iTrader: (1)

dude, just go disconnect your battery for a couple minutes, then if the cel comes back then take it in. Otherwise theyll hit you with a $104 diagnostic.

nycgps

iTrader: (1)

Disconnect your battery for a minute. plug it back in.

Start your car, u'll see lots of lights on the dash come on, DSC light flashing, Just turn ur steering wheel all the way to the right then the left, it will shut off, then just shut off the car and restart it, notice your car might stall on you for a couple of drive cycles. Thats because ECU is relearning your driving. So nothing much to worry about.

if the same CEL comes back after a while, replace your gas cap. thats all.

whitetigerkiller

Can i automatically take this "Evap emission control system leak very small. p0456"
as gas cap..... problem for sure? what does p0456 mean?

what if I really do have evap emission control system leak... is this a big problem?

thanks for all the replies guys.
very helpful.

Renesis07

iTrader: (1)

the evap leak is your gas cap. there have been rx8s with bad gas caps before that kept throwing cels even after they were tightend, otherwise if you had an actually gas leak, you would smell gasoline. 99% sure its your gas cap.

nycgps

iTrader: (1)

Im dead tired today cuz I just bike for like 7 hours (NYC Bike Tour 2008) but meh, last one b4 I head to bed.

Your car comes with emission control system (duh), it contains a lot of *self* test at various level to MAKE SURE that it will do as little harm to the earth as possible.

and the P0456 happens when : The System will do a self test after you shut your car off, this test is like a *leak* test, it records the level of pressure in your tank, then after couple of hours it will check the pressure again, if there is no leak, pressure should be the same right? if there is a leak, that means well, there is a leak *somewhere*. P0456 is a very small leak, meaning gas fume leak out for some reason, and its harmful to the earth. and this usually happens when your Gas Cap is not sealing properly.

So just buy a new gas cap. I mean its not expensive. just get it from here.

http://www.finishlineperformance.com...cat=273&page=1

12.95 bux, OEM gas cap (new version), so no leak. That site has a lot of RX-8 maintenance stuff so u might want to take a look around before u order from them. make your shipping cost worthwhile (its couple of bux. UPS)

whitetigerkiller

thanks to ^ you guys
I am learning something.

So I am going to think its gas cap....
Hopefully this doesnt cause any problem while I am drving...
I have been driving hopefully its okay for me to drive around with CEL on.

I am gonna check with my dealership, see what they can do.
Hopefully get something good from them

thanks again for all of you who have applied.

whitetigerkiller

I disconnect the Positive right? just the positive?
after reconnect I just have to turn steering wheel, i guess.
then just shut off the car and restart it. you said "stall" I hope you meant still.
hope that solves it!

Socket7

Why don't you just spend 10 bucks at autozone and get a new gas cap and be done with it rather then messing about with the dealer?

Haze

It's your Gas Cap.

This is the gas cap TSB:

http://www.finishlineperformance.com...26-07-1800.pdf

There is another TSB for the fuel filler neck, but that is only for '06 and '07 cars.

whitetigerkiller

which one do I disconnect? positive? negative? both?
then which one am I supposed to take it off first? I forgot

Haris

Just take both off. It doesn't matter which one, the point of this whole thing is killing electricity flow to your ECU.

Green Thunder18

I've had two gas caps go bad in the last 2 years. First one was under warranty - 2nd wasn't. Couldn't believe it could be the gas cap again so stupidly took it to the dealer. Most expensive gas cap ever!

nycgps

iTrader: (1)

It doesnt really matter which one but You should take the Positive off first, AKA the *hot* wire.

take both off actually, then let it sit for 10 minutes of so, reconnect.

zoom44

emissions warranty is 80k miles

Haze

An excellent point by Zoom since the gas cap is part of the emissions system.

Jon316G

iTrader: (1)

Electrically speaking it does not matter which terminal you disconnect. When the circuit is broken no current can flow. It does not matter whether the circuit is open at the positive or at the negative terminal.
But when you loosen the nut at the positive terminal of the battery you will need to use a spanner. When turning the spanner (steel) it may easily touch a metal part of the car body. That will create a massive short circuit!
However when you first loosen the clamp on the ground terminal you can have the spanner touch the body of the car without any ill effect. The only thing to look out for is that it does not touch the positive terminal of the battery.
With the ground clamp disconnected you can just leave the wire dangling somewhere away from the battery and you are entirely safe. There is even no need to disconnect the positive terminal.

Just my 2 cents

Steve-O

Just want to let anyone know that has this issue with the P0456 code that I did this and it worked. I think there was just a glitch in the system from when I started it after a long winter of sitting around.

restiller

Just got a CEL for that one this morning! What a time waster at the dealership.

mike73737

+1 I vote negative terminal