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Bosch SR0421X Starter Motor
| Brand | Bosch SR0421X |
|---|---|
| Mounting Bolt Hole Quantity | 2 |
| Mounting Hardware Included | No |
| Mounting Shims Included | No |
| New Or Remanufactured | Remanufactured |
| Nose Cone Material | Aluminum |
| Nose Cone Type | Closed Nose |
| OE Recommendation | Yes |
| Original Equipment Manufacturer Names | BO |
| Power Rating | 1.1 |
| Solenoid Attached | Yes |
| Starter Finish | Aluminum |
| Starter Rotation | Clockwise |
| Tooth Quantity | 9 |
| Voltage | 12 |
| Product line | Starter (Remanufactured) |
| Fits | Audi and Volkswagen · 25 vehicles |
OE direct replacement. Remanufactured starter built for dependable starting performance.
Aluminum nose cone. Lightweight construction helps support durability and heat resistance.
Solenoid attached. Integrated design simplifies installation and reduces extra parts.
Cross-references 06B911023 for the same application. See all 1.
Bosch Remanufactured Starter for Audi and Volkswagen
Bosch SR0421X is a remanufactured 12-volt starter built for reliable engine cranking in select Audi A4, Audi A4 Quattro, and Volkswagen Passat applications. It features a clockwise rotation, integrated solenoid, aluminum nose cone, and a 9-tooth drive for OE-style starting performance.
Key Features
- Remanufactured Bosch starter for select Audi and Volkswagen vehicles
- 12-volt unit with 1.1 power rating
- Clockwise starter rotation
- Integrated solenoid attached
- Aluminum nose cone with closed nose design
- 9-tooth drive gear
- 2 mounting bolt holes
- OE recommendation noted by the manufacturer
Product Details
The Bosch Premium Starters line is remanufactured to meet demanding starting-system requirements with attention to performance and reliability. Part number SR0421X is engineered for direct replacement use in select 1998-2005 Audi A4 and A4 Quattro models, plus 2000-2005 Volkswagen Passat applications. This starter cross-references Bosch 06B911023 for the same application.
Compatible fitment includes 1998 Audi A4 and A4 Quattro late production, 1999-2004 Audi A4 and A4 Quattro, 2004 Audi A4 through 06/2004 and specific chassis breakpoints, 2005 Audi A4 and A4 Quattro with listed chassis limits, and 2000-2005 Volkswagen Passat models. Bosch SR0421X is a practical OE-style replacement when the original starter shows wear, slow cranking, or intermittent engagement.
What This Starter Helps Address
- Slow or weak engine cranking
- No-start conditions caused by starter failure
- Intermittent starter engagement
- Grinding or inconsistent starter drive operation
- Electrical starting-system wear in high-mileage vehicles
Installation Notes and Tips
Verify chassis breakpoints and production dates before ordering, especially for 2004-2005 Audi A4 and A4 Quattro applications. Confirm the 12-volt system, clockwise rotation, 2-bolt mounting pattern, and 9-tooth drive match the original unit. Mounting hardware and shims are not included, so reuse or source the correct installation components as needed. Always inspect battery condition, cables, grounds, and charging-system output during replacement.
Quality Assurance
Bosch remanufactures this starter to support OE-level fit and function expectations for the listed applications. The SR0421X is part of Bosch’s Premium Starters line, which is built and tested for dependable starting performance in Audi A4, Audi A4 Quattro, and Volkswagen Passat vehicles.
| Year | Make | Model | Body Type | Drive Type | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|---|
| 2005 | Audi | A4 | Convertible | — | 1.8L | L4 | N/A | To Chassis # 8H-5-005 700; Starter (Remanufactured) |
| 2005 | Audi | A4 | Sedan | — | 1.8L | L4 | N/A | To Chassis # 8E-5-030 000; Starter (Remanufactured) |
| 2005 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | To Chassis # 8E-5-030 000; Starter (Remanufactured) |
| 2005 | Volkswagen | Passat | — | AWD | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2004 | Audi | A4 | Wagon | — | 1.8L | L4 | N/A | To 06/2004; To Chassis # 8E..5..040 000; Starter (Remanufactured) |
| 2004 | Audi | A4 | Convertible | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2004 | Audi | A4 | Sedan | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2004 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2004 | Volkswagen | Passat | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2003 | Audi | A4 | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2003 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2003 | Volkswagen | Passat | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2002 | Audi | A4 | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2002 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2002 | Volkswagen | Passat | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2001 | Audi | A4 | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2001 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2001 | Volkswagen | Passat | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2000 | Audi | A4 | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2000 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 2000 | Volkswagen | Passat | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 1999 | Audi | A4 | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 1999 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Starter (Remanufactured) |
| 1998 | Audi | A4 | — | — | 1.8L | L4 | N/A | Late Production; Starter (Remanufactured) |
| 1998 | Audi | A4 Quattro | — | — | 1.8L | L4 | N/A | Late Production; Starter (Remanufactured) |
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