Power Steering Pump 21-5451 Fit for Nissan Frontier Pathfinder Xterra

Our review of the 21-5451 power steering pump examines whether this direct-fit replacement is a sensible option for owners of 2005-2012 Frontier, Pathfinder, and Xterra models with the 4.0L V6. The bottom line: it is a practical, lower-cost alternative that delivers the core function most buyers seek - restoring steering assist and handling without reworking mounting or hoses. Installers report a snug fit and straightforward swap-in, making it a good choice when the original unit fails and you want a like-for-like replacement.

Key Features

• Direct compatibility: Designed to replace OE part numbers such as 21-5451 and 491109CA0A so it fits 2005-2012 Frontier, Pathfinder, and Xterra 4.0L applications without modification.
• Complete unit with pulley: Supplied with the pulley installed to simplify installation and reduce the need to transfer components from the old pump.
• Durable materials: Constructed from corrosion-resistant aluminum and iron components to withstand heat and road conditions for longer service life.
• Leak-resistant design: Uses quality seals and robust machining to limit fluid loss and help maintain consistent steering assist performance.
• Quieter operation claimed: Built to reduce noise compared with worn OEM pumps, improving cabin comfort when functioning normally.

Who It's For

This pump is aimed at owners and independent mechanics who need a cost-effective, direct-fit replacement for failed or leaking power steering pumps on Nissan Frontier, Pathfinder, and Xterra models from 2005 through 2012 with the 4.0L V6. It suits people who want to avoid custom modifications and prefer a unit that matches OE dimensions and mounting locations.

Those who should look elsewhere include drivers who require dealer-original branded parts for warranty reasons, or buyers who need a pump for vehicle models or engines outside the stated 4.0L V6 fitment. Also consider a remanufactured unit from a specialty supplier if you need factory certification.

Pros & Cons

Pros

• Good fit for the listed Nissan models and years, reducing installation hassle.
• Includes pulley and arrives as a complete replacement, saving time on the bench.
• Constructed from aluminum and iron to resist corrosion and handle high temperatures.
• Customers report clear value for money compared with more expensive alternatives.

Cons

• Some users have reported mixed results on noise level, so quiet operation may vary by vehicle and installation.

Specifications

Fitment	2005-2012 Frontier / Pathfinder / Xterra 4.0L V6
OE Part Numbers Replaced	21-5451, 215451, 5894, 96373M, 491109CA0A, 49110EA200
Condition	New complete unit with pulley
Materials	Aluminum and iron components
Included	1 x Power steering pump with pulley
Main Function	Provide hydraulic assist for steering control and stability

Our Verdict

For most owners of 2005-2012 Nissan Frontier, Pathfinder, and Xterra 4.0L vehicles the 21-5451 power steering pump represents a practical, value-oriented replacement that restores steering assist with minimal fuss. It matches OE dimensions, arrives complete with pulley, and uses corrosion-resistant materials, making it a sensible buy unless a factory-branded unit or specific dealer warranty is required.

Frequently Asked Questions

Will this pump fit my 2008 Pathfinder 4.0L?
Yes, it is listed to fit Pathfinder models from 2005 through 2012 with the 4.0L V6; verify your original part number before ordering.

Does the unit include the pulley?
Yes, the pump is supplied as a complete assembly with the pulley installed to simplify replacement.

Is noise a known issue?
Some customers reported mixed noise results; proper installation, correct fluid, and system bleeding can affect how noisy the pump is in use.