depending on the year many of them give you codes by blinking the engine light after you turn the key on off on off on they always start with 1 blink then 2 which means 12 which i think means start of test. ends 0n 55(end of test. to understand the codes you need a haynes manual as there are too many to list here.
That requires a scan tool.
A sacn tool is required.
With a code reader that plugs in under the drivers side dash.
Put the key in the ignition, and turn it from "off" to "run" (WITHOUT STARTING) Three times. The odometer screen should then start to read out the stored fault codes.
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With a scan tool.
The link below has a complete list of OBD 2 codes
With a scan tool.
You need a scanning device to read the codes. Many auto parts stores can do this for you at no charge in hopes that you purchase the parts from them needed to fix the problem. There are scanning devices out there you can purchase for under $100 if you want to make the investment.
End of message, no more codes.
Bring it to a shop or an auto parts store where they can hook up an OBD II scanner and read the trouble codes. Turn the light off by either fixing the problems the codes tell you, or have the person reading the codes turn off the indicator light using the scanner.
Cycle the ignition key three times from off-run, off-run, off-run. Then watch digital odometer display for codes. It will say "done" when all codes have been displayed.