Question about 2005 Mercedes-Benz Mercedes Benz SLK350

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Check Engine light keeps coming on and staying on

The diagnostics says the gas cap is not on properly. But it is on properly. Happens every few hundred miles.

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Hi there, this is not uncommon, you see the gas cap is probably on properly, just check the gasket it might be cracked, pinched or warped, and every so often it might leak

Posted on Aug 28, 2008

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Why did the check engine light come on


The check engine light usually comes on due to emissions issues. I'd bet that tank of gas was the culprit. Run it nearly empty and then fill up again. If it doesn't go out in a few days take it to an auto parts store and have them read the code. At that point my guess would be O2 sensors.

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99% of the time, the gas cap wasn't tightened properly, or is leaking. Make sure you twist it tight and it clicks a few times. If the "Check Engine" light stays on after a few days, buy a new gas cap. Again it may take a few days to clear.

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Service engine light stays on


Hi Patricia:
If the "Check Engine" light came on soon after a fill-up at a gas station, check if your gas cap is closed properly. If the gas cap wasn't on tight, this could be the problem. Secure the gas cap properly and if there is no other problems, the "Check Engine" light should clear itself out in a few days of driving. If the gas cap was tight, there is some other problem. Have your car computer scanned to see what is wrong. It could be some minor problem, but it also could be something more serious that can cause more damage to your vehicle if not repaired in time. Some garages or parts stores often offer to scan your computer for free. Others will charge you a diagnostic fee. If your car is fairly new, I'd advise to visit your dealer for this, because it's possible that the problem is still covered by the original warranty and can be repaired for free or a minimum charge. Check your owner's manual for more details.




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CHECK GAS CAP / ENGINE SERVICE ARE ON


Most likely an evap system fault code stored in engine computer. Best bet and cheapest thing is go to the dealer and buy a new cap. Install the cap and drive the car for a few days if the light goes off, your all set, if not you need to check for codes. Then probably find a leak or a faulty evap vent valve or purge valve.

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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

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F-150 ford truck check engine light keeps coming on


Did you replace the gas cap? Also check the filler tube that's where the gas cap snaps on where you put gas in. The filler tube or neck has a thin lining of plastic at the top look for small cracks in it where the gas cap goes on. It there's cracks in it, it will cause an emission leak and sometimes a dealer won't find it until you spent a lot of money on diagnostics. And it depends if there best mechanic was working on it.

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06 chevy impala v6 3.9 liter engine. Check engine


there is a large evaporative leak. keep away form ottozoo, they dont have the brain power to actually diagnose a light bulb., their job is to sell parts., if they sell you the wrong parts tough.Take it to a qualified repair shop that does a lot of GM work or the dealer.

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try replacing the cap itself.
make sure its on tight untill it clicks a few times.

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Check engine light keeps coming on replaced gas cap already


Your problem is in the evaporative emission system which is designed to prevent the escape of fuel vapors from the fuel system. Leaks in the system, even small ones, can allow fuel vapors to escape into the atmosphere. The light coming on can be caused by one of the following:

1. Defective or loose fuel cap
2. EVAP canister or hose cracked- not connected
3. Purge or vent solenoid defective
4. Vacuum leak at engine Government regulations require on-board testing to make sure that the evaporative (EVAP) system is functioning properly. The leak detection system tests for EVAP system leaks and blockage. It also performs self-diagnostics. You have tried the easy fix, the gas cap. Finding the leak now will require special equipment and testing procedures, might be better left to a professional.

Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

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Check engine light/gas cap will not stay tight.


Yes, the gas cap will cause the Check Engine Light to come on. Will set code P0441 if I remember correctly. It should be okay to drive it. If you would like to confirm the code, take the truck to an auto parts store like Autozone and have them hook up their scan tool and read the code. If its P0441 it will probably be something like EVAP or Evaporative system leak.

Its an easy enough fix while your there too, just pick up a new gas cap or you could pick up an OEM one from the dealership.

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