Check engine light came on but nothing different has happened

[Dannaye]

Everything still seems fine


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[bakedziti]

What's the code associated with it?

[Dannaye]

What's the code associated with it?

Not sure really. I don't have a vag com but it was super random. Drove to the bank turned off the car turned the car on and noticed it and drove home and everything was fine still


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[hockeysc23]

Suggest stopping by an Advanced Auto or anyone that can read codes. My car felt fine when my check engine came on and then the next start was significantly worse. The result was my timing chain tensioner failed and an expensive repair to follow including towing.

[Dado]

It usually tells you whether you may continue driving or not


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[Dannaye]

Suggest stopping by an Advanced Auto or anyone that can read codes. My car felt fine when my check engine came on and then the next start was significantly worse. The result was my timing chain tensioner failed and an expensive repair to follow including towing.

How much do they charge for that?


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[mecg]

Usually it's free. Also, the CEL is turned on by the ECU strictly for EMISSIONS reasons. It does not come on for mechanical issues and whatnot unless they are directly affecting emissions of the engine.

[Dannaye]

Usually it's free. Also, the CEL is turned on by the ECU strictly for EMISSIONS reasons. It does not come on for mechanical issues and whatnot unless they are directly affecting emissions of the engine.

Lately I've heard a little rattle sound coming from under the passenger glove box. I'm assuming that's probably the reason but idk what it is. I'll heard over to autozone


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[19birel]

That rattle sound is probably completely unrelated, we had something similar and it was our a/c fan...

Advanced Auto probably won't be of too much help if they don't have a VAG specific scanner which my local one sure didn't

[Dannaye]

The code is P0456. Small evap leak it says. what's that mean?


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[mecg]

Did you get gas recently? If so, is the gas cap on tight?

[Dannaye]

Did you get gas recently? If so, is the gas cap on tight?

Last Sunday I got gas. I twisted the cap till I heard a click. The guys at Firestone when I called with the code said 9 out of 20 times its just a gas cap issue lol


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[Dannaye]

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[mecg]

I'd take the cap off and then put it back on. Bet the light goes out in a few restarts.

[Dannaye]

I'd take the cap off and then put it back on. Bet the light goes out in a few restarts.

I'm gonna do that and also clean it up, got some old gas residue and dirt around it


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[Dannaye]

I'd take the cap off and then put it back on. Bet the light goes out in a few restarts.

Nope :/ cleaned it out and turned on and off like 6 times


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[mecg]

If you go by Autozone again this weekend stop by and have them reset the code.

[Dannaye]

If you go by Autozone again this weekend stop by and have them reset the code.

I'm at Audi currently buying a new cap. Mine was super old and dirty. Side track but does your gas ever increase? I was at 285 miles and it randomly went up to 290 miles. It happens pretty often for me


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[mecg]

You mean the gas mileage to empty? Sure. That's just an estimate based upon your current mpg and the amount of fuel left in your tank. It will go up and down with your average mpg - usually higher on the highway and lower in town driving.

[Dannaye]

You mean the gas mileage to empty? Sure. That's just an estimate based upon your current mpg and the amount of fuel left in your tank. It will go up and down with your average mpg - usually higher on the highway and lower in town driving.

Bought a new cap and didn't fix it :/


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[Dannaye]

Starting to smell burning fuel lol


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[mecg]

It takes a certain amount of restarts to clear the ECU - I don't know how many. On my Saab it's 50 restarts for most codes if you don't reset it. That's why I suggest having AutoZone reset it for you.

[Dannaye]

It takes a certain amount of restarts to clear the ECU - I don't know how many. On my Saab it's 50 restarts for most codes if you don't reset it. That's why I suggest having AutoZone reset it for you.

I'm here now, gonna see what happens


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[ranchos]

I had my car in the dealer a few time for small evap leak. They swapped tons of sensors and shit, didn't work. They needed to replace the charcoal canister.

But it's usually the gas cap.

[Dannaye]

I had my car in the dealer a few time for small evap leak. They swapped tons of sensors and shit, didn't work. They needed to replace the charcoal canister.

But it's usually the gas cap.

How much was the charcoal thing? I just read on a forum that's all some guy had to replace also


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[ranchos]

How much was the charcoal thing? I just read on a forum that's all some guy had to replace also


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Free! I'm under warranty.

[Dannaye]

Free! I'm under warranty.

Lol 112k. Mine just expired :/ but the part isn't too much


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[van462]

Small evap leaks can be very hard to hunt down. Shops do a smoke test to find leaks but its possible it can be so small that the smoke will not be visible from it. Remove the plastic engine cover and on the intake manifold is the N80 valve. Look over the lines going to it. This often turns into swapping parts out one by one to see if it fixes it.

[Dannaye]

Small evap leaks can be very hard to hunt down. Shops do a smoke test to find leaks but its possible it can be so small that the smoke will not be visible from it. Remove the plastic engine cover and on the intake manifold is the N80 valve. Look over the lines going to it. This often turns into swapping parts out one by one to see if it fixes it.

Yea I know an ex Audi mechanic that works at the Firestone by my house and he said they'd run a smoke test and take it from there. Only problem he said is my car is too low for their lifts lolol


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[Dannaye]

My neighbor has a vag com. He reset the code for me, how do I know he didn't just turn the code off. Would the check engine light come back on if fixing the gas cap wasn't the problem


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[Gunnark100]

My neighbor has a vag com. He reset the code for me, how do I know he didn't just turn the code off. Would the check engine light come back on if fixing the gas cap wasn't the problem


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You cant turn this code off, only reset, if fault will came back you get engine light on again!

[Dannaye]

You cant turn this code off, only reset, if fault will came back you get engine light on again!

Haha my bad I meant reset. So I should be good then? I turned the car on and off 10 times and no light came back on.


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[Gunnark100]

So I should be good then?
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Hopefully!

[Dannaye]

Hopefully!

Let's hope. I read people try and drive a certain miles after resetting so my drive to Tampa now should help ha


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[Gunnark100]

Let's hope. I read people try and drive a certain miles after resetting so my drive to Tampa now should help ha


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Yes, your fault was leak related, so drive and see what happens after few miles, days etc!

[Dannaye]

Yes, your fault was leak related, so drive and see what happens after few miles, days etc!

Idk if this really matters, I put cardboard under the car last night and no leaks. But we shall see with this drive


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[Gunnark100]

Idk if this really matters, I put cardboard under the car last night and no leaks. But we shall see with this drive


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Nothing will reach cardboard with this error!(99.9%:))
http://www.obd-codes.com/p0456

Just enjoy

[mecg]

Idk if this really matters, I put cardboard under the car last night and no leaks. But we shall see with this drive


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This code is about a vacuum leak, not a fluid leak. For several years now all cars have to have a built-in system to keep gas fumes from escaping into the air. This is done with the evap system. It needs a vacuum to operate correctly while the car is running and if there is any issue at reaching the correct vacuum that's when this code will be triggered.