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Question:

what does it mean when your check engine light comes on?

what does it mean when your check engine light comes on?

Answer:

Probably an O2 sensor. Get her checked soon.
It means the COMPUTER has seen a problem that needs to be looked at right away! take it to a garage that can run a diagnostic on the computer
Open the drivers door, under the dash is the OBD 2 port, plug in the code reader, read the code this will tell you what engine system or component failed and triggered the light to go on, fix the problem. Some auto parts stores do this for free, or have your mechanic deal with it.

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