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Yellow check engine light

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New S-Class (W222) 2014-Present

Yellow check engine light

 
Old 02-28-2019, 05:32 PM
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2015 S550 4MATIC AMG Sport package, 2006 S500 4Matic (Sold)
Yellow check engine light

The Check engine light has come on in my 15 S550. This happend about a month ago and I call the dealership and that itís likly a loose gas cap if the car is running normally. It went out in a few days and now itís back on. The gas cap was never loose when I checked.
I am curious if anyone else has experienced this and if do what was the cause.
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Old 03-01-2019, 09:40 AM
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2004 W240
It's possible there is a faulty gasket on the gas cap. But, there are several other reasons a Check Engine light comes on. They all have to do with emissions control systems, such as cats. The only way to know for sure is to get the fault codes read.
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