21756511 Genuine Volvo/Mack D11/MP7 D13/MP8 D16/MP10 DOC Catalyst

Genuine Volvo/Mack D11/MP7 D13/MP8 D16/MP10 DOC Catalyst — Function and Service Importance This diesel oxidation catalyst is the aftertreatment’s furnace — the catalyst stage that oxidizes unburned fuel and CO, and makes the heat that active regeneration and downstream SCR chemistry depend on. When the system needs temperature, the DOC is what turns dosed fuel into degrees. Why this oxidation catalyst matters: Regeneration lives on this catalyst’s light-off: a poisoned, face-plugged, or thermally damaged DOC cannot make regeneration heat, and the failure cascades downstream as soot-loaded DPFs and cold SCR chemistry — with the DOC’s killers (oil, coolant, raw-fuel events) usually…