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  • Duramax NOx Sensor 5WK96645H Replacement Guide: Fault Codes, Diagnostics & DIY Install

    , by iFJF Direct Duramax NOx Sensor 5WK96645H Replacement Guide: Fault Codes, Diagnostics & DIY Install

    Complete guide to diagnosing and replacing the downstream NOx sensor (5WK96645H/12669595) on Duramax LML and L5P engines. Covers fault codes, step-by-step install, and OEM vs...

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