Just bought a 2000 C 230 K with 139, 000 KM on it. Very clean and excellent drive. The fuel warning light keeps lighting up and does not go away untill I shut engine down and restart later. I checked the tightness of the fuel filler cap , because the manual reads that a lose fuel cap could cause the blinking. Well I dont think it is. Also, almost everytime the fuel light comes on the "Check Engine" light also comes on.

Also between 100km/hr to 130km/hr the car has a vibration which goes away if I exceed 130km/hr or drop below 100km/hr. I checked the PSI in all tires, left rear was short a few PSI. I didnt test yet but I am just putting this info out.

I checked the oil, its slightly below max marking.

Should I have this diagnosed at a shop? Any hints?

THX

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM