In brief, the current Subaru WRX relies on electric power steering and has no power steering fluid reservoir; older WRX generations used hydraulic power steering that does require fluid.
What powers the steering in the WRX?
Most recent WRX models implement electric power steering (EPS), which uses an electric motor to assist steering and does not require hydraulic fluid. This design reduces maintenance since there is no fluid to check or replace. By contrast, older WRX generations used hydraulic power steering (HPS) that relies on engine-driven pumps, hoses, and a reservoir of steering fluid.
How to tell which system your WRX has
Use these simple checks to identify whether your WRX uses EPS or hydraulic PS:
- Look under the hood for a power steering fluid reservoir. If you see a reservoir labeled “Power Steering Fluid,” your WRX uses hydraulic PS.
- Consult the owner's manual or a dealership to confirm the steering system type for your exact model year and market.
- Note the steering feel: EPS typically provides variable assist and will not have a fluid level to monitor, whereas hydraulic PS requires fluid in the reservoir and can exhibit leaks.
- Check the VIN or service history if you’re buying used; the documentation should state the steering system specification.
Conclusion: The presence of a hydraulic reservoir and pump points to hydraulic PS; absence of a fluid reservoir and use of an electric motor points to EPS.
Maintenance considerations by system
For hydraulic PS (if applicable to your WRX year), regularly check the PS fluid level with the engine off and the car level, top up with the correct Subaru PS fluid (or accepted equivalent) if it’s low, and inspect for leaks around hoses or the steering rack. If you notice foaming, discolored fluid, or a spongy or stiff steering feel, have the system inspected promptly.
For EPS, routine fluid checks are not part of normal maintenance, and steering issues are typically diagnosed via the vehicle’s computer. If you experience a warning light related to EPS, unusual steering effort, or noises from the column, seek professional service.
Note that some spec variants or trims may still use hydraulic PS for certain markets or configurations; verify with a dealer if in doubt.
Bottom line
Across its latest generations, Subaru has shifted the WRX to electric power steering, which means there is no power steering fluid to manage. If you own an older WRX model, you may still be dealing with hydraulic PS that requires fluid and regular maintenance. Confirm your exact model year with the owner’s manual or a dealer to be sure.
Summary
In short: modern Subaru WRX cars use electric power steering (no PS fluid). Older WRX models used hydraulic power steering with a fluid reservoir. Always verify your specific vehicle’s system via the owner's manual or dealer to understand maintenance needs and potential issues.