It could be anything at all that is electrical or sensor-related in nature. Your car is an OBD2 car (for emissions), and it's a very strictly-controlled system. As a result, pretty much anything that fails will cause the light to come on and will store a code in the computer. Go to AutoZone and ask them to scan your computer for codes - they'll do it for free, where a dealer will hit you for up to an hour's labor. They'll tell you the fault codes, which will point you in the right direction for the fix. Get the codes that come out of the scan and post them as a reply here and we can go from there.
SOURCE: Lacetti Chevrolet. Malfunction Indicator light is on.
It may be the same problem as my 56 plate Lacetti. The yellow malfunction light came on two weeks ago and two days ago, both times shortly after filling up with petrol to the brim, and I suspect it is the petrol sensor as I only clicked the petrol cap once after fitting it back - the handbook says click it several times. The yellow light also came on yesterday after taking the car a short journey so it is likely that the sensor is still picking up a small escape of petrol, but the car has been fine today with no light appearing now that the fuel level has dropped a bit. Like you, I have not noticed any drop in power with the light on.
SOURCE: Malfunction Indicator Lamp (MIL)
I had the samething happen to my Jetta. I took it to the dealer and nothing was wrong.
I would think it's safe to drive until Monday when the VW shop opens.
My 2 cents
SOURCE: 2000 Toyota Platz malfunction indicator lamp stays on
let me tell you its solution....:)
do check all filters and engine oil...
if it still remains then replace its battery ...
its all done
SOURCE: malfunction indicator lamp in my toyota corolla is on how i fix?
The check engine light also called the malfunction indicator comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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