🔧 RX350 - Power Steering “Pump” Replacement (EPS System Check)

Your RX350 does not use a hydraulic power steering pump. It uses Electric Power Steering (EPS), where an electric motor and control module assist steering through the steering rack.

If you were told “power steering pump,” the real repair is usually related to the EPS rack/motor, steering column/EPS sensor, wiring, or a 12V battery/charging issue.

Difficulty Level: Intermediate | Estimated Time: 0.5-1.5 hours (diagnosis) / 4-7 hours (EPS rack replacement)

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⚠️ Safety & Precautions

• 🛑 Turn ignition OFF and keep the key/fob away from the car while working.
• 🛑 Disconnect the negative battery terminal before unplugging EPS connectors.
• 🛑 Support the RX350 with jack stands if you lift it—never rely on a jack.
• 🛑 Do not rotate the steering wheel with the steering shaft disconnected; it can damage the spiral cable (airbag clock spring).

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🔧 Required Tools

You'll need the following tools for this repair:

• OBD2 scan tool with Toyota/Lexus EPS codes (Techstream-compatible) (specialty)
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 3/8" torque wrench
• Trim clip removal tool
• Flathead screwdriver
• Flashlight
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• No power steering pump applies (EPS system) - Qty: 0
• EPS steering rack assembly (if confirmed failed) - Qty: 1
• Front subframe/steering rack mounting bolts (if required by service procedure) - Qty: 1 set
• Inner/outer tie rod ends (only if worn or seized) - Qty: 2-4

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📋 Before You Begin

• Park on level ground, wheels straight, and set the parking brake.
• Chock the rear wheels with wheel chocks.
• Plan to scan the RX350 first—EPS repairs are much easier with the stored codes.
• If you’ll unplug EPS connectors: disconnect battery negative using a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm it’s EPS (no pump/reservoir)

• Open the hood and use a flashlight to look for a power steering fluid reservoir/cap—your RX350 should not have one.
• If you see a “fluid leak,” it’s likely engine oil, coolant, or transmission fluid, not power steering fluid.

Step 2: Pull EPS trouble codes (most important step)

• Plug in an OBD2 scan tool with Toyota/Lexus EPS codes (Techstream-compatible) (specialty).
• Turn ignition ON (engine can be OFF) and read codes from EPS/Power Steering.
• Write down any codes and freeze-frame data. Codes prevent guesswork.

Step 3: Quick 12V power/connection check

• Turn ignition OFF.
• Disconnect the negative battery terminal using a 10mm socket.
• Inspect battery terminals for looseness/corrosion; tighten with a 10mm socket as needed.
• Visually inspect accessible EPS harness/connectors for damage (pinched wires, rodent damage).

Step 4: Basic steering feel test (engine running)

• Reconnect the battery negative using a 10mm socket.
• Start the engine and slowly turn steering lock-to-lock while parked.
• Note symptoms: heavy steering, intermittent assist, warning light, clicking, or grinding.

Step 5: If codes/symptoms point to the EPS rack

• At this point, “replacing the pump” translates to EPS rack replacement, which requires lifting the RX350 and removing undercovers and steering connections.
• Because EPS rack procedures can vary by production details and required calibrations, I’ll give you the exact replacement steps once I know the codes and your symptom.

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✅ After Repair

• Clear EPS codes using an OBD2 scan tool with Toyota/Lexus EPS codes (Techstream-compatible) (specialty) and re-check for returning codes.
• Road test and confirm steering assist is smooth and the steering wheel returns to center normally.
• If the rack/steering angle sensor was serviced: a calibration may be required with a scan tool.
• Get a 4-wheel alignment if any steering/tie-rod parts were removed.

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💰 DIY vs Shop Cost

Shop Cost: $1,500-$3,500 (diagnosis + EPS rack/motor assembly + alignment)

DIY Cost: $0-$2,200 (parts only, depending on what failed)

You Save: $300-$1,500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 4-7 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.

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Quick questions (so I can give you the exact repair steps):

• 🧾 What symptoms do you have: heavy steering, EPS warning light, noise, or a fluid leak?
• 🔎 What EPS codes (if any) did your scan tool show?