Bosch SR4245X Starter Motor

Bosch Remanufactured Starter SR4245X

The Bosch SR4245X is a remanufactured 12-volt starter built for dependable cranking performance and consistent starting reliability. It is engineered for select Mazda applications, including Mazda 3, Mazda 3 Sport, Mazda 6, CX-5, CX-30, and CX-50 models listed below.

Key Features

• 12-volt starter with a 1.4 power rating
• Remanufactured Bosch Starter (Remanufactured) line product
• Clockwise starter rotation
• 11-tooth drive gear
• Closed nose design with aluminum nose cone and aluminum finish
• Solenoid attached for direct replacement use
• 2 mounting bolt holes
• Fits Mazda applications from 2014-2023, depending on model

Product Details

Bosch Premium Starters are remanufactured, built, and tested to deliver consistent starting performance and reliability. The SR4245X uses a closed nose aluminum housing, clockwise rotation, and an attached solenoid to match the original starter configuration on supported Mazda vehicles. This part number, SR4245X, is a direct-fit starter option for Mazda 3 and Mazda 3 Sport models from 2014-2023, Mazda CX-5 from 2014-2023, Mazda 3 from 2014-2021, Mazda 6 from 2014-2021, Mazda CX-30 from 2020-2021, and Mazda CX-50 for 2023.

This part cross-references Monroe Shocks & Struts (e.g., PY0118400) for the same application.

What It Helps Solve

• Slow or weak engine cranking
• No-start conditions caused by starter failure
• Intermittent starting after key or push-button engagement
• Grinding or inconsistent starter engagement
• Electrical starting issues tied to worn starter components

Installation Notes

Verify the vehicle’s year, make, model, and starter configuration before installation. The SR4245X uses 2 mounting bolt holes, a clockwise rotation, and an attached solenoid, so matching the original unit is important for proper fitment. Mounting hardware and shims are not included, so reuse or source the correct hardware as needed. Confirm the 11-tooth drive gear and closed nose design match the removed starter before installation.

Quality Assurance

Bosch remanufactured starters are built and tested to meet application-specific performance and reliability requirements. The SR4245X is a remanufactured starter designed for OE-style fitment on the listed Mazda vehicles.