Description
Factory Subaru WRX STI Workshop Manual (2017-2021)
This official factory-level service manual delivers complete repair and maintenance coverage for the VA-chassis Subaru WRX STI sold in the US market from 2017 through 2021, including all special editions and trim levels.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | EJ257 2.5L DOHC turbocharged boxer four-cylinder (310 hp) |
| Diesel | N/A |
| Transmissions | 6-speed close-ratio manual |
| Drive | Symmetrical AWD with Driver Controlled Center Differential (DCCD) |
| Model Years | 2017, 2018, 2019, 2020, 2021 |
| Badge Twins | STI Limited, Type RA, Series.Gray, S209 (US-market special edition) |
Common WRX STI Repairs Covered
| System | Procedures |
|---|---|
| EJ257 Head Gasket | Cylinder head removal, gasket replacement torque sequences, cooling system bleed procedures |
| Timing Belt & Water Pump | Timing belt inspection, tensioner replacement, water pump R&R with service intervals |
| DCCD & Differentials | Center differential service, front and rear differential fluid change, DCCD controller diagnostics |
| Brembo Brake System | Six-piston front caliper rebuild, rotor replacement, brake pad bedding procedure, ABS/VDC diagnostics |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the EJ257 head gasket replacement procedure included?
Yes. The EJ257 2.5L turbocharged boxer is known for head gasket failures, and this manual provides the complete step-by-step procedure covering cylinder head removal, gasket selection, torque sequences, and cooling system bleed-down specific to the 2017-2021 WRX STI.
Which special editions and trim levels are covered?
All VA-chassis WRX STI variants sold in the US are covered, including the base STI sedan, STI Limited, Type RA, Series.Gray, and the US-exclusive S209. Procedures and specifications apply across all trim levels for model years 2017 through 2021.
Are the DCCD and SI-DRIVE systems documented?
Yes. The manual includes detailed diagnostics and service procedures for the Driver Controlled Center Differential (DCCD), the SI-DRIVE engine response controller, and all related electronic control modules, including wiring schematics with connector pin-outs.
What format is the manual?
This manual is a PDF document, compatible with Windows, Mac, Linux, iOS, and Android devices. After purchase, you receive an instant download link and retain lifetime access for re-downloads at no additional cost.
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