Walker 550-2104 Fuel Injector

Walker 550-2104 Fuel Injector for Nissan Applications

Walker Products fuel injectors are built for fuel system service where OEM-level fit and consistent delivery matter. Part number 550-2104 is a direct replacement for select Nissan models, including Altima, Maxima, Murano, and Quest applications across the 2002-2009 model years.

Walker Products has supplied fuel system components since 1946 and backs its product development with in-house engineering, manufacturing, and technical support. The Walker Products line includes fuel injectors and other engine management parts for repair and replacement work on modern fuel-injected vehicles.

Key Features

• Fuel injector replacement for select Nissan fuel injection systems
• Walker Products part number 550-2104
• OE-style replacement built to meet or exceed OEM standards and specifications
• Supported by Walker Products engineering, product management, and technical documentation
• Cross-reference: Bosch 62378

Vehicle Fitment

• Fits 2004-2009 Nissan Quest, N/A
• Fits 2004-2008 Nissan Maxima, N/A
• Fits 2005-2006 Nissan Altima, N/A
• Fits 2002-2004 Nissan Altima, N/A; fits vehicles manufactured from September 2003
• Fits 2004 Nissan Murano, N/A; to 10/2003
• Fits 2003 Nissan Murano, N/A; from 07/2003

What This Fuel Injector Helps Address

• Hard starting caused by inconsistent fuel delivery
• Rough idle related to injector wear or clogging
• Misfire conditions tied to poor atomization
• Fuel trim issues from uneven injector performance
• Loss of throttle response from restricted fuel flow

Installation Notes and Tips

Confirm engine application, model year, and build date before ordering, especially on 2002-2004 Altima and 2003-2004 Murano vehicles with date-specific fitment notes. Inspect injector seals, connectors, and fuel rail condition during service, and follow factory procedures for fuel system depressurization and leak checks.

Quality Assurance

Walker Products is an ISO 9001 and IATF 16949 certified manufacturer with a long history in fuel system components and engine sensors. Part number 550-2104 is produced to support OEM-style service requirements for Nissan Altima, Maxima, Murano, and Quest fuel injection repairs.