Mazda 3 P Codes (Powertrain) P0100 - P0199 P0137

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Codes P2177, P0401, And P0137?

2008 MAZDA 3
The First Code That Appeared Was P2177. After A Few Weeks P0401 Showed Up. Prior To Both Codes The Egr Valve Was Replaced. Vacuum Leak...
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