Ok I just got a 2007 chevy malibu privately owned I have a question the only thing wrong with it is the check engine light comes on and the gas gauge is broke it tells me I have no gas but I know theres gas in the tank I think 2 codes came up one was the senso the other was a high circuit something or whether can someone refer me to a decent mechanic that wont pay an arm and a leg to get it fixed or roughly give me a price?