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welcome to HS first of all.
for the d4 light the bulb might be burnt (simple as that). the lights are switching on from the gear shift lever inside the car. there is a big switch right there that will make the lights go on and off. and for the gas mart might be time for a tuneup. what's your average mpg ? Also without a muffler i noticed that my car would suck on gas big time. i really wouldn't worry about anything to ther car, except the frame.
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