In most Sprinter vans with hydraulic power steering, the fluid goes into a dedicated reservoir in the engine bay and is topped to a marked level. Newer Sprinter models that use electric power steering have no fluid reservoir to fill. Always check the owner's manual or a dealer for your exact VIN and model year to be sure.
Hydraulic power steering (older Sprinter models)
Many older Sprinters, including certain NCV3/T1N generations, use a hydraulic power steering system with a separate reservoir. The following steps help you locate the reservoir, check the level, and refill if needed.
Follow these steps to locate the reservoir, check fluid level, and refill if needed:
- Open the hood and locate the power steering pump and its reservoir. It is usually mounted on or near the pump and connected to the belt drive, with hoses running to the steering rack.
- Inspect the cap and the side of the reservoir for markings. The cap is typically labeled “P/S” or “Power Steering,” and the reservoir should have MIN and MAX level indicators.
- With the engine off and the vehicle cold, check the fluid level. The level should sit between the MIN and MAX marks. If it’s below the minimum, you need to add fluid.
- Use a clean container or funnel to add Mercedes-approved power steering fluid (MB-approved PSF) slowly into the reservoir until you reach the MAX mark. Do not overfill.
- Replace the cap securely, start the engine, and slowly turn the steering wheel from lock to lock a few times to bleed air from the system. Check for leaks and recheck the level with the engine off and cold; readjust if necessary.
Bleeding the system may require a few cycles of turning the wheel, and you should always monitor for leaks or unusual noises. If the fluid appears milky, foamy, or smells burnt, stop and have the system inspected by a professional.
Electric power steering (EPS) in newer Sprinter models
Many newer Sprinters rely on electric power steering, which eliminates the hydraulic fluid reservoir entirely. If you have an EPS-equipped van and notice heavy steering, a warning light, or intermittent assist, the issue is typically electrical rather than fluid-related.
Check these items if you suspect EPS issues:
- Dashboard warning lights related to steering or vehicle stability systems
- Battery health and charging system status, since EPS depends on stable electrical power
- Relevant fuses and wiring harnesses connected to the steering column and EPS motor
- Steering angle sensor, torque sensor, and related control modules for faults
- Diagnostic trouble codes (DTCs) using an appropriate OBD scanner or a Mercedes dealer diagnostic tool
If issues persist with an EPS system, contact a qualified technician or a Mercedes dealership. EPS problems can require software updates, sensor calibration, or component replacement rather than a fluid refill.
Fluid specifics and maintenance tips
When working with hydraulic power steering, always use fluids that meet Mercedes-Benz specifications and avoid mixing different types. Do not overfill the reservoir, and inspect the system for leaks, cracked hoses, or damaged seals. If you’re unsure of your Sprinter’s exact configuration, consult the owner’s manual or a dealer before adding fluid or attempting bleeding procedures.
Summary
In short, determine whether your Sprinter uses hydraulic or electric power steering. If hydraulic, locate the reservoir in the engine bay, fill to the marked level with a Mercedes-approved PS fluid, and bleed air by turning the steering wheel. If your Sprinter uses electric power steering, there is no reservoir to fill, and steering issues point to electrical components, fuses, or sensors. When in doubt, refer to the manual or seek professional service.