toyshet

hi. i have a 2001 c180. the car would not start after about a week or so of not being driven. thought the battery had gone flat so took it out and charged it over night. it started quite alright after that. however, the problem now is the computer seems to be out of sorts. it shows different error messages. sometimes says there are 2 malfunctions, sometimes 1 malfunction, sometimes 4 and sometimes 3! other times says the brake pads are worn, etc. sometimes the car starts, other times it does. the computer was reset but now im told the esp control module is bad and needs to be replaced. please help! is this something that can be fixed or i have to buy a new esp control module? how much would this cost please?