Question about 2007 Mercedes-Benz C230 Sedan

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Engine light on tried to see if the fuel cap was not on right but the engine light is on still

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You need to have the computer scanned to see What codes are in there to cause the light to come on. There are hundreds of possibilities. A dealer will charge an hour's labor to do this five-minute procedure. Click my screenname and go to my tips and tricks - I have one in there on how to get this done free of charge.

Posted on May 16, 2010


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Have a 2010 Ford Fusion check engine light came on had it scanned at Autozone. Code stated that it was my O2 sensor. Now my check fuel fill inlet warning has came on. I do not have a gas cap, it is the...

I know my barrina when gas cap was missing had check engine light on did diagnostic said o2 sensor as well so got a cap from gas station reset computer now no lights on everything fine had something to do with pressure in tank not right

Nov 18, 2013 | Cars & Trucks

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Fuel cap light is on

I assume you allready checked to see that cap is on straight/ tight. right?

remove cap and look at it's base sealing ring (O-ring) it's sort of a brown color or white if it's missing , squashed flat anywhere or just don't look right (loose fitting) replace entire cap with new

this year car has what is called a dead space fume return system where by the dead space (area in fuel tank not submerged in gas) has a hose connecting it to intake manafold for reason of burning off fuel vapors and not allowing them to exit into air (air polution) helps your fuel econ as well maybe something bad with that ?

Nov 06, 2013 | 2005 Ford Explorer

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Wy my fuel tank exaust sistem turns the engine light on, the cap looks all right

some are not the fuel system makes your engine light on, most of it are from the ignition system. the ECMs reads,may be, your coil deffective. the engine will run but engine light's still on.

Jan 27, 2012 | 2000 Dodge Caravan

1 Answer


When the Fuel Cap is not attached, your fuel tank loses pressure and a sensor detects this. This causes your Check Engine Light to come alive. Replace the cap and wait for the code to disappear or go to Autozone and have them clear the code for you.

Oct 25, 2011 | 2001 Lincoln Continental

2 Answers

My 2003 S-10 with 48,000 had the check engine light come on today. I just recently bought the truck from an elderly lady that stated she has never had a problem with the truck. I put 85 Octane gas into...

The difference in fuel type won't turn the check engine light out. You may be on the right track with the new fuel cap, they are very common to set an EVAP code, usually P0442 for a small leak (such as a loose or leaking gas cap). The other problem they are known for is code P0128 for a faulty thermostat, opening too soon. It's still best to have it scanned at a large parts retailer, usually for free, then diagnose the actual trouble code rather than just the symptoms. There are literally 1500 trouble codes for your vehicle alone.

Mar 01, 2011 | 2003 Chevrolet S-10

3 Answers

Check fuel cap light went on today. how do i fix it?

If you refueled your vehicle with the engine running, this is what caused the light to come on. Otherwise, your fuel cap may not be on correctly. Check your fuel cap and make sure it is installed correctly. Be sure that it "Clicks" when you tighten it. Then drive the car for a couple days and the light should go out on its own. If it does not go off in 2 or 3 days, then you need to have your evaporative emissions (fuel tank) system checked for leaks.

Feb 19, 2011 | 2003 Mercury Grand Marquis

1 Answer

Engine lightcomes on when my Sienna sits idling for a few minutes

The fuel system is a pressurized system designed for optimum environmental protection. If the fuel cap is loose it will trigger the light to come on. If it is coming on all the time and you can turn it off by tightening the fuel cap, it's probably time for a new fuel cap. The internal pressure relief valve in the fuel cap itself may have gotten old and is not holding the right amount of pressure or is vibrating loose. Try replacing the fuel cap and seal, and see if this fixes the problem. Make sure you bring the old one in with you to the auto parts store so they can make sure it is an exact match. If the fuel cap is worn out, it may not pass state inspection. (I'm not sure if your state checks for that, but NJ does) Good luck and don't forget to rate! Thank you!

Mar 01, 2009 | 2004 Toyota Sienna

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Check fuel cap light

Good Day,

Probably just a bad seal in the cap. You can purchase a new one from any auto parts store or dealer. Just make sure they cross-refrence the new cap to your car as diffrent caps have diffrent pressure ratings, and you wanna make sure you get the right one. And yes a faulty cap can cause your check engine light to come on as the fuel is not pressurized properly for the motor. Once the cap is replaced with a new one remove your negative battery terminal for a few moments, then re-connect this will clear you check engine light. If you don't do this you engine light will stay on forever.

Good Luck
Hope this helps

Jun 30, 2008 | 2003 Ford ZX2

1 Answer

Engine light

Your evap system is detecting a small leak. the seal of your gas cap is at fault. Make sure you hear the cliicking of the cap when re-installed. If it still makes your light come on, replace the fuel cap.

Jun 23, 2008 | 2006 Chrysler Town & Country

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