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SOURCE: bmw 318i e30 j reg
what the light looks like? if it looks like a little engine then thas the check engine light than tells you when a sensor is not working good and needs to be check with scan tool in an auto repair
but nothing to be worry car will be driveable but won't pass smog test until fix, if light does not loook like a little engine or motor then let me know how doe it look like
SOURCE: M43 engine wont start, fuel pump maybe?
Does it crank when you try to start it?
Does it even makes the effort to hump a little and the goes off again?
Probably a good tune-up and a new gas pump and fuel filter and you should be good to go.
SOURCE: 318i bmw e30
Probably the alternator but I'd check it to be sure first. Many auto parts stores will check you whole charging system for free so call around.
thanks.
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