Actually a gas cap not secured properly could cause a Check engine light. It usually shows up as a major EVAP leak because there is a fuel tank pressure sensor in the tank. It atleast happens on all of the Mercedes cars I work on. It is just another check to keep vapors from entering the atmosphere.
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99 Silver GT Auto
DTA Built Engine w/P&P heads, TDC Turbo (T-76), Built 4R70W, PI Multi-Disc 3200 T/C, Eaton 31 Spline Carrier, Strange 31 Spline Axles, Aeromotive 1000 HP fuel system, 66lb injectors, MSD DIS4, Accel DFI Gen VII & Mac 3" cat-back.
Built by Jade Performance
Best on Nitto D/Rs
11.698 @ 120.898 @ 12 psi (built block)
Best on Slicks
10.922 @ 122.95 (stock longblock)
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