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check engine light

My check engine light came on last week.  I took my car (1999 Corolla) to the mechanic the next day.  After leaving it there the whole day, the mechanic told me he was halfway through figuring out what was wrong with it and if I needed the car I should take it and bring it back a few days later.  He said it would be safe to drive for a few more days, and it was possible the light would turn off by itself in which case I wouldn't have to bring it back.  After a few days the light turned off by itself, so I didn't bring it back.  Four days after that the light came on again.  It's been on for the last two days.  What does that mean?

Re: check engine light

  • Did your mechanic scan the car for the "trouble code/problem code"? 

    If not go to an Advance Auto or Auto Zone and have them hook up an OBD2 sensor  to it ( this scans the codes on the cars computer). Once you have the code, google it. You can also buy an OBD2 sensor but it runs about $22 on Amazon. 

     We have a scanner and have used it on my car ( evap code came up and it was just the damn gas cap not being on right), hubby's car ( bad vacuume line)  and my moms car ( gas cap). 

    What strikes me odd is your mechanic taking a day and he was only half way through trying to find the problem?? The codes can be vague and really need some visual inspection but....

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  • I have no idea, but I'd take it back just to be safe.
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  • Did you take it to a dealership or an independent mechanic? It's pretty shady that it's taking this long to figure out what the problem is. The majority of a mechanic's bill comes from labor costs, and I'd hate to think he's padding his bill this way. Normally, if you take it to a dealership, they can hook it up to an engine diagnostic computer and instantly come up with a code that tells them what the problem is. It's not free, but they usually absorb the diagnostic costs into the repair fees. Not cheap, but better than if the first mechanic using you to line his pockets.
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  • You need a new mechanic. It takes the kid at Auto Zone two minutes to scan the code from a check engine light. Your mechanic doesn't want to spend the cash on the software, but that shouldn't be your problem.

    It could be a lot of things. I'd put a fiver on a dirty oxygen sensor, but only if the spread was good.

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