Dorman 904-5501CD Diesel Exhaust Fluid (DEF) Filler Cap

DEF Filler Cap for OE-Style Replacement

Dorman 904-5501CD is a diesel exhaust fluid (DEF) filler cap built to match the fit and function of the original cap on specified vehicles. It is made for dependable sealing performance and everyday durability in DEF service.

• Direct replacement DEF filler cap for specified applications
• Matches original fit and function for a secure closure
• Built for durability in diesel exhaust fluid system use
• Includes retention ring as listed in the package contents
• Cross-references Monroe Shocks & Struts (e.g., 572.3006, 21148728) for the same application

Application Details

Compatible With select diesel vehicles that use a DEF filler cap in the emission control system. Use part number 904-5501CD to verify the correct replacement before ordering. This Dorman DEF filler cap is a practical service part for restoring the filler opening on vehicles that rely on a sealed DEF tank cap, including applications commonly searched as DEF filler cap replacement and diesel exhaust fluid cap replacement.

Common Problems It Can Help Solve

• Missing or damaged DEF filler cap
• Loose closure at the DEF fill opening
• Contamination entering the DEF tank area
• Broken or worn cap retention component

Installation Notes and Tips

Confirm the original cap style and vehicle application before installation. Inspect the filler neck and retention ring area for wear or damage, and make sure the cap seats fully after installation. For fitment-based searches, this part is often referenced for DEF filler cap replacement on diesel emission control systems and for Dorman 904-5501CD application lookup.

Quality Assurance

Dorman designs this cap to match original equipment fit and function on specified vehicles, with a focus on reliable performance and durability in diesel exhaust fluid service.