Skip to content
Free Standard Shipping on Eligible Orders Over $100 in the Contiguous U.S.
Free Standard Shipping on Eligible Orders Over $100 in the Contiguous U.S.

2871878 Genuine Cummins DEF Doser Injector

P/N: 2871878 Manufactured by: Cummins
Original price $209.00 - Original price $209.00
Original price
$209.00
$209.00 - $209.00
Current price $209.00
1 in Stock
We accept:
  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa
Not Sure Which Part Fits?
Our support team is here to help.
+1 (828) 209-8010
Monday – Saturday | 8:00 AM – 8:00 PM (EST)
Fast 2–3 Day Shipping
30-Day Returns
In Stock & Ships Fast
Expert Support Available
2-Year Warranty

At Line Truck Parts LLC, we are committed to providing reliable automotive parts and a transparent customer experience. Eligible parts purchased directly from our website are covered by a 2-Year Limited Warranty, giving you added confidence in your purchase. Learn More

Product Overview

The 2871878 is a genuine Cummins DEF Doser Injector designed for Cummins and Paccar diesel engine applications. This dosing valve operates within the diesel exhaust fluid system, injecting DEF into the exhaust stream ahead of the SCR catalyst for emissions system operation.

Product Features

The 2871878 DEF Doser Injector is manufactured to Cummins factory specifications for diesel exhaust fluid dosing.

  • Injects diesel exhaust fluid into the exhaust stream
  • Operates ahead of the SCR catalyst
  • Supports DEF dosing system function
  • Applies to Cummins and Paccar diesel applications
  • Used in heavy duty diesel engine service
  • Supports aftertreatment operation on class 8 truck platforms

Technical Specifications

Condition New
Part Number 2871878
Brand Cummins
Part Type DEF Doser Injector


Installation Notes

The 2871878 DEF Doser Injector should be matched to the correct Cummins or Paccar engine application before installation. Inspect the DEF line, electrical connector, mounting area, and SCR aftertreatment components during service.

Verify part number, VIN, engine configuration, production date, emissions package, and applicable factory options before installation.