Bosch SR4315N Starter

Bosch SR4315N Starter Overview

The Bosch SR4315N is a new 12-volt starter built for reliable engine cranking in Subaru applications. It features a grounded aluminum case, a closed aluminum nose cone, and an attached solenoid for a direct-fit replacement on select Subaru WRX, Forester, Crosstrek, Impreza, and XV Crosstrek models.

As part of the Bosch Starter (New) line, this unit is engineered and tested for consistent starting performance and dependable operation. The SR4315N is also designed for automatic start/stop operation, making it a practical choice for vehicles equipped with that system.

Key Features

• 12-volt starter with 1.2 power rating
• New construction with grounded case design
• Aluminum housing and aluminum closed nose cone
• Counterclockwise (left) starter rotation
• Solenoid attached for streamlined replacement
• Flange mount design with 2 mounting bolt holes
• Designed for automatic start/stop operation
• Compact length of 7.755906 in

Detailed Product Description

Bosch SR4315N is a starter assembly for Subaru vehicles that need a direct replacement starter with OE-style mounting and electrical configuration. It measures 80.5 mm from mounting flange to end of case and 48.8 mm from mounting flange to pinion end at rest, helping confirm proper fit during application matching. The unit uses a grounded case, aluminum housing, and closed nose cone construction for a durable, service-ready design.

This part cross-references Subaru 23300AA631 for the same application. For shoppers searching for a Bosch SR4315N starter for Subaru WRX, Subaru Forester starter replacement, or a starter for Subaru Impreza and Crosstrek models, this part number is the key identifier to verify before ordering.

Vehicle Fitment

• Fits 2015-2020 Subaru WRX, N/A
• Fits 2014-2018 Subaru Forester, N/A
• Fits 2016-2017 Subaru Crosstrek, N/A
• Fits 2012-2016 Subaru Impreza, N/A
• Fits 2013-2015 Subaru XV Crosstrek, N/A

Common Starting Issues This Part May Address

• Engine no-crank condition when the starter motor has failed
• Slow or inconsistent cranking during ignition
• Clicking at start-up caused by starter wear or solenoid issues
• Intermittent starting problems on Subaru WRX, Forester, Impreza, or Crosstrek applications
• Starter noise related to worn internal components

Installation Notes and Tips

Confirm the part number SR4315N and verify vehicle application before installation. This starter uses a flange mount with 2 bolt holes and does not include mounting hardware or shims, so reuse or source the correct hardware as needed. Because starter fitment depends on rotation, nose cone style, and electrical configuration, compare the original unit to this Bosch replacement before installation.

Quality Assurance

Bosch Premium Starters are built and tested to support dependable starting performance and long-term reliability. The SR4315N is a new starter assembly, not remanufactured, and is produced to meet the demands of modern Subaru starting systems.