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San Antonio, TX
Have replaced a TON of throttle position sensors for this EXACT issue.the sensor will get a bad spot in it and tell the pcm a higher voltage than what it should.Most of the time it will not set a code,this is an "in spec failure"
I'll give you the flat rate tech's most probable cause checklist, check the wires at the connector at the coil specifically the wire that controls #1 cyl firing,you'll need a wire diagram for this. make sure the wire is not broken,it'll feel like stretch armstrong's finger if the wire is broken at the connector.if that feels normal, connect a test light with the clip on the batt. positive terminal and probe the pin in the coil connector while someone cranks it,should flash.if no flash then ohm the wire between the coil and the pcm for open circuits,if no flash and good circuit then you have a faulty pcm driver. if the circuit is open,just backtrack until you find it.good luck
make sure and check related fuse
are you talking about the service engine soon light? if so you will need to take it to a shop and get it scanned and find out what code you have and go from there.
The easiest and first thing to check is to make sure your battery state of charge and the connections on the battery are good and clean.Another thing to check is the door ajar switches are good,a bad door ajar switch will trigger an alarm event much like someone opening a door without disarming.
At 100k I flush all fluids of a vehicle.Some manufacturers suggest it a different intervals,but those intervals are put in place by pencil pushing engineers that have never had grease under their nails.It never hurts to change fluids.
It definitely does not look good for the repair shop.Sometimes there are subsequent failures when repairing a vehicle,meaning when you fix one problem another problem that was there before can show it's ugly face only after you have fixed the first thing.But 3 times does not sound right.
It depends on the vehicle,but for the most part a coolant flush,trans service,rotate tires,inspect brakes,fuel filter,air filter,top all fluids,and an overall vehicle inspection.
The easiest thing to try is giving the starter a whack with a wrench.I've rescued many folks at the stores,homes,etc with this old school method.If it starts head to your nearest parts store and get a good starter.If not,then you'll need to dig further and diagnose.
A possibility is the ignition switch,not the part you put your key in but the electrical part behind it that sends voltage to the relay and starter.They are known issue with BMWs.Have someone check voltage at the starter while you turn the key to the start position.And while they are down there have them tap on the starter with a large wrench,if the starter is faulty most of the time tapping on it while you turn the key will get things cranking.good luck,let us know what you find.