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Q: manual check engine light on 2000 Pontiac Bonneville

How to manually check the codes for check engine light
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you need a code reader. no other way.

even a reader will not tell you the failure, just the system failure.
let a shop do a real diag for you.

chrysler can be done by cycling the ket 3 times but does not translate the code into terms we know without a manual. they are the only ones.

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