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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28
AC Delco: PF857
0L (2004–2010)
Verify your hood bumper location and OEM number before ordering — Peterbilt uses several different hood bumper sizes at different points on the hood and front clip
Confirm engine serial number
Freightliner MT45 / MT55 step-van and walk-in chassis
PAI 853761 Inlet NOX Sensor | Replaces Mack 20958942 davco AC Delco: PF857Inlet (upstream) NOx sensor for Mack and Volvo MP D platform heavy duty diesel engines PAI 853761. Mounts upstream of the SCR catalyst and reports raw exhaust NOx to the aftertreatment ECU for closed loop DEF dosing control. The 4 pin rectangular connector, M20 1. 5 exhaust boss, and 23" overall harness length match Mack OEM 21636091 and Mack Volvo 22303390. Signs You Need a New NOx Sensor Aftertreatment fault codes referencing the upstream inlet NOx
