started out as a VERY SMALL leak, now is SMALL leak.... codes are p0456 and p0442..... i cant find fuel filters online for the rx8, i feel stupid asking this but, does it have one?? could a dirty fuel filter result in these codes? (its not my gas cap either) i really hope its the fuel filter causing this light because i dont want to shell out big bucks at the dealer..

 

a fuel filter will not cause that code. you have a evap leak make sure gas cap is tight. one way to find a leak is by filling the system with smoke but you need a special machine that only a shop will probly have. double check all your lines make sure there is no cracks or disconnected evap solenoids.btw how many miles and wat year

 

Why are you so sure its not the gas cap? 99/100 of theese that i see at work it is the cap. If you tightened it then it may just need to be replaced.

 

To the OP, it is your gas cap. Buy a new one light will go away. Also, the 8 does have a fuel filter, problem is is located as an integrated unit with the fuel pump.

 

check under neath the car i got the same code and i got a same code like you i have a small leak underneath

 

same thing happened to me like 2 days ago i had my engine check light on so i got it scanned and it was the same error I checked underneath the car and there was no leak so I tightened the gas cap and they reseted the brain it was good for 3 three days but the light just came on again yesterday. What do you guys think is the problem?

 

As stated above its the gas cap. Go buy a $10 cap (Stant part #10838). Just because the old cap doesnt fall apart in your hands means its ok.

 

If its not the gas cap (and it may not be), or a rubber fitting at either end of the fuel line, the biggest culprits are the leak diagnostic pump (LDP) and the charcoal canister. The LDP pressurizes the system slightly and any loss in pressure indicates a leak. The charcoal canister allows excess fuel vapor to condense and run back into the tank. I had a recurring P0456 that turned out to be a hairline crack in the charcoal canister. It was located after a smoke test.

If I were you, I'd start with the gas cap, and if that fails to fix the leak, check all the fittings for the fuel system starting in engine bay where the fuel line comes in, and then move back to the charcoal canister and LDP. The lines are all steel I believe, but the fittings are all rubber and clamps.

A P0456 code may be difficult to track down, its not a huge leak and requires multiple failures before the ECU trips the CEL.

 

do yourself a favor and take it somewhere with a smoke machine (even the dealer can handle EVAP stuff).

 

ya my light wo uld come on, it was the gas cap, id get it reset, then about 3 days later it'd come back on, so it jus stays on now. im gonna get a new gas cap tho, is it only $10 from the dealership?

 

The only thing cheap at a dealership is the coffee in the waiting area. I bought my cap from AMAZON But you should be able to find that cap at a local store.

 

yeah, i know about the smoke machine.... i was working at nissan but we didn't have one there.... im gonna go today and buy a gas cap, thanks for all your advice!

 

ok, just replaced cap and cleared all my codes.... i had 7 codes total that had accumulated in the last maybe 2k miles(some i had twice).... they were:

p0456 (leak very small
p0442 (leak small)
p2407 EVAP system leak, Detect pump Sense CKT, Intermittent (i have no idea what this means but i had 2 of them)

and finally
p0455 (leak large)


the light isn't on now but i have only driven 3 miles since i cleared the codes.... hopefully it stays off but if not i will let you guys know. What does the p2407 code mean?

 

what does this mean?
P2407 EVAP system leak detection pump sense circuit intermittent ON 2 Evaporative

 

Check the connections to the leak diagnostic pump. Like I said above, perhaps it needs to be replaced.

 

do you guys think it is a really important thing that needs to be fixed or is it ok to drive like that for a while?

 

its probably fine to drive you will just get worse get mileage and a possible decrease in performance. just go buy a new fuel cap, they are 13$ at the dealer... wish i had done it when my light first came on

 

nope a cel important.. that would be stupid.. duh.

beers

 

dude, you have a leak somewhere in your fuel system.... address it.

 

the tool to remove the pump cost more than the pump itself.

 

^HAHA, that's what a mallet and a screw driver are for!

 

well... over 120 miles and still no light... "praying" that it stays off lol

 

yea when i first had the light on, i got it reseted and after 30 miles it came on again. I think its fine now dude. I am going to the dealer tomorrow and getting a gas cap I hope it ll solve my problem too cuz i know there is no leak!

 

I've gone through 2 mazda caps so I bought one from Advance Auto for like $11 and it's been great so far.

 

I just got the engine smoked today and there were no leaks so I just got a new cap. I hope it'll cure this problem it has been 10 miles since i put the new one. I'll keep you guys posted!