Check Engine Light Stays on After Repairs

First, make sure your mechanic truly knows how to read the OBD information. I was fortunate enough to find one here in my area who seems to really know what he is doing. He found the cause of a SES light on both my Z3 and my E39. Both were related to, what in my mind, would be odd causes. One was an O-Ring on the dipstick, causing an air leak, and the other was related, in a way - a cracked valve cover. Relatively speaking, the cures were not overly expensive. According to what my guy tells me, he can connect his computer to the diagnostics in the car, and drive the car, watching readouts change with engine speed and load. He even found a faulty brake-light switch. Don't give up.

engine light in red or yellow. both can be linked to differing issues and ones in yellow dont always log codes.

it is a yellow code

this could be due to many things but one that doesnt always leave a code is the oil level/condition sensor which can cause sporatic engine and oil level lights despite the engine being fine.

dude make sure the gas cap is on. you have to click it after filling up several time

Will the Peake scan tool find the errors needed to turn it off???

you need check out the code first, then the code can tell you what's wrong with your car, for your car the EOBDII/CAN OBDII Scanner PS100 can read code for you. http://www.chinasinoy.com/wholesale/eobdii-can-obdii-scanner-ps100-750.html

I just got a 2011 BMW 535I and it has 73,556 miles on it and runs great strong engine but my check engine light just came on and only had car for 3weeks to a month now any ideas why check engine light just came on for no reason oil is new everything is new in it and it just came on yesterday can someone shield some light on my issue please lol thanks