When I bought the car which is a 1998 750 BMW the engine light wasn't on. Put gas in the car and the engine light hasn't went off. It rides very smooth, no problems other than check engine light stays on. have noticed very little Idleing up every now and then. oil change done, light still on.
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I think that is scan tool only but most mechanics have the scanners these days so it will be a lot cheaper to go to your local mechanic instead of the dealer. It prob wasn't reset last service if the light wasn't on at time of service.
99% of the time, the gas cap wasn't tightened properly, or is leaking. Make sure you twist it tight and it clicks a few times. If the "Check Engine" light stays on after a few days, buy a new gas cap. Again it may take a few days to clear.
You need to have the code pulled, then cleared. That should have been done with your diagnostic tests. Many parts places like AutoZone will do this for you for free. It could be something as simple as a gas cap but it could also be more serious like a catalytic converter.
If there is a fuel vapor leak, it will record the same code as a faulty gas cap. That would mean that you need a new filler hose which is where you put the nozzle in to fill up your car with gas. This is a more expensive fix than a gas cap. I am guessing that the code which was pulled suggested a gas cap OR something more serious.
You may have more than one code being recorded. Your best bet would be to disconnect your battery for 20 minutes or so, then drive the car until the check engine light comes on again then take it to have the codes pulled. Those codes sometimes stack up and maybe it wasn't reset after you replaced the cap.
It may go out on its own, the next time the computer does a routine system check. If two or three runs around town over the next few days doesn't clear it, only a dealer or a good mechanic with the proper scanner can turn it off.
You can go to Autozone and they will scan it for free and tell you why its on. If you dont notice anything and it drives normally, then it's probally an Oxygen sensor. It won't hurt anything if you keep driving it will just use a tiny bit more gas than normal. I would have it scanned anyways. You can also open the gas cap and let the pressure off the tank if there is any pressure in it. Sometimes that causes the check engine light to come on. If you bought the car from a car lot and the check engine light wasn't on the disclosure, they should have to fix it or you can file a complaint against them with their field investigator at the DMV. A good scanner can tell how many times the check engine light came on and when the code was cleared. If it was cleared right before you bought the car it usualy means the car lot tried to get away with not fixing the problem. Good luck and I hope it's nothing too serious.
Just bought a 95 525i. It is not exactly overpowered in the horsepower department. I was talking about that yesterday with a BMW mechanic. He said to use "the good stuff" i.e. 93- yes it costs more, but your MPG will be somewhat higher, and your engine should be a little more energetic. He said to stay away from the warehouse gas places- Costco, Sams, and Sheetz. They tend to have a high percentage of ethanol in their gas, which will eventually destroy your catalytic converter... as time goes by, ethanol is getting harder to avoid. The gas station should have a sign saying if their gas has ethanol, and what percentage. You can use it if you have to, but don't make a habit out of it.
yes the light is because of the gas cap being gone (sets code in evaporative emissions system), replace the gas cap, disconnect the battery for five minutes and that will turn of/reset the light, make sure u have the radio code before u do this, if u don't u will have no radio after the battery is disconnected..
the only problem is the floater of your gas tank.It is easy to be fixed all you need to do is to take the back seat off and you will going to see the upper portion of your gas tank there's a circular or square portion plate that have a 4 bolt's on it and a electrical wire just loose the bolt's and pull the floater up, then you will see there it's electrical mechanism just clean it by using a sand paper to clean the bronze part then turn on the key switch, move the floater up and down check the gas gauge. it is not pricey though if you want it to be fixed by a mechanic.