NEW Volvo & Mack Hydrocarbon Dosing Module | 21534115, 21870667, 22452551 | Volvo D11, D13, D16 / Mack MP8

The AHI module controls the amount of fuel that goes to the 7th injector during a regen. If you have a failed AHI module, passive, active, and forced DPF regens will all fail. You cannot bypass the AHI module to do a forced regen. The system will fault out and cause a high soot condition. There are various small ports inside the AHI module in which the components and passages inside wear over time. This causes fault codes that cause a severe derate. Eliminate all the hassle and purchase a direct replacement. This carries a one year warranty.