21534115 Diesel AHI Dosing Module Replacement Part For Mack Engine

21534115 Diesel AHI Dosing Module Replacement Part For Mack Engine This premium 21534115 diesel AHI dosing module is a direct OEM‑equivalent replacement compatible with Mack MP7 and MP8 heavy‑duty truck engines, cross‑referencing OE numbers 23185531 and 21870667. It precisely controls fuel supply for the 7th injector to support stable DPF passive, active and forced regeneration, effectively resolves common faults like regeneration failure, aftertreatment‑related trouble codes