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Re: 2003 Durango 4.7 P0421 and CAT monitor unsupported
Posted to Emissions Forum on 9/28/2009 2 Replies

From an internal note I found:

OBD Change Summary (2003MY) AN/DN/DR (4.7L A4/A5/M5) FF007T Field Fix FF007T includes software and calibration updates. Software is updated to Phase 4.9.2. The OBD calibrations were revised, with changes to the following monito... Login to read more.

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