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Q:

how much will it cost to replace an EGR circuit with the diagnostic code of P040 on 2001 Oldsmobile Alero

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The check engine light keeps coming on
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(2) Comments
that is a code for insufficient flow. you need to verify that vacuum and exhaust are getting to the valve before jumping to any conclusions. I would have a shop verify this and give you a pin point reason for the failure.

Roy