Denso 210-4238 Alternator

Denso 210-4238 Reman Alternator Overview

The Denso 210-4238 reman alternator is a 12-volt charging system component built for specific Mazda applications, including the Mazda 6 and Mazda MX-5 Miata. It uses an internal fan, clockwise rotation, and a 100-amp output to support the vehicle’s electrical load with OE-style fit and function.

Denso reman alternators are rebuilt and tested to demanding electrical standards, with attention to rotor, stator, rectifier, bearings, and slip-ring finish. This helps deliver stable charging performance for vehicles with sensitive electronics and modern power demands.

Key Features

• 12.0-volt alternator with 100 amp output
• Internal fan design and clockwise rotation
• External regulator type
• Built to Denso First Time Fit standards for proper mounting
• Remanufactured to OE-style assembly and validation benchmarks
• Compact, lightweight design for charging system service

Product Line Details

Denso Reman Alternators are part of the brand’s OE-focused charging system line. The remanufacturing process includes electrical testing of major internal components, bearing validation to OE standards, and slip-ring finishing to reduce brush wear. The result is a reman alternator engineered for consistent output and correct installation on the listed Mazda platforms.

Detailed Description

This Denso alternator, part number 210-4238, is a direct-fit remanufactured charging component for 2006-2009 Mazda 6 and 2006-2008 Mazda MX-5 Miata models. It is designed for vehicles that rely on dependable alternator output to keep the battery charged and the electrical system operating correctly. The 100-amp rating supports everyday driving loads and factory electronics without requiring changes to the original mounting layout.

This part cross-references Bosch AL4239X for the same application.

What It Helps Address

• Battery warning light caused by alternator output loss
• Low charging voltage during idle or driving
• Electrical system instability from worn internal alternator components
• Noise or wear related to aging bearings and slip rings
• Fitment issues from non-OE-style replacement units

Installation Notes and Tips

Verify the vehicle’s original alternator specifications before installation, including amperage, rotation direction, and regulator type. This Denso 210-4238 alternator is listed for 2006-2009 Mazda 6 and 2006-2008 Mazda MX-5 Miata applications, so confirm the existing unit matches the OE-style configuration before replacement. Inspect the belt, pulley alignment, battery condition, and charging connections during service to help ensure proper system operation.

Quality Assurance

Denso reman alternators are tested through electrical and mechanical validation steps that include high-voltage checks for stators, rectifiers, and rotors, along with OE-standard bearing verification. The brand’s First Time Fit standards are used to support correct mounting and reliable service on the listed Mazda applications.

Compatible With 2006-2009 Mazda 6 and 2006-2008 Mazda MX-5 Miata, this reman alternator is built for OE-style charging performance.