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there are a couple of way to do this but the best way is to have the engine serviced by a professional.
that being said if i couldn't afford to have it serviced i would unplugg the battery for about 15minutes maybe longer with all the power unplugged the vehicles computer will "forget the problem and your check engine light will go away temporarily .
the other way to turn off the check engine light is to get OBD2 scanner and manualy remove the check engine light(its an option on the OBD2 scanner) but again this is inly temporary. the only true way to get rid of the check engine light is to have the problem fixed .
okay so you turn off the check engine light and its all gravy but then about 50-1oo miles later the light comes back on ...that means that you didnt fix the problem and the light is back on.
With an OBD2 scanner (about 125-250$$$) depending on how advanced you want it, check the Code(example=P0215) then go online and look the code up it will tell you exactly what that code means and if its a small part like an MAF censor then you can actually go buy it at AUUTOZZONE or whatever and do the job your self.
find someone with a Scanner(OBD2) and scan your vehicle then most of your issues ill be gone if you can do the job yourself.
FYI the PO215 code is not a MAF censor code that was just an example ...sorry oh and if you try to smog the vehicle with the code or check engine light erased but not fixed it wont pass smog it will come up as incomplete on the test and you will have to drive it another 75+ miles to get the light back on to figure out what is wrong with it.lol...been there done that and it made me look stupid for trying to cheat the system.lol
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