21870667 Diesel AHI Dosing Module Replacement Part For Mack MP7 MP8 Engine

21870667 Diesel AHI Dosing Module Replacement Part For Mack MP7 MP8 Engine This OE‑replacement 21870667 AHI dosing module is specially designed for Mack heavy‑duty trucks equipped with MP7 and MP8 engines, cross‑compatible with part number 23185531AHI, accurately controls fuel injection for the 7th injector to support DPF passive, active and forced regeneration, fixes common issues such as regeneration failure, exhaust‑related fault codes and aftertreatment system breakdowns;