🔧 BRZ - Starter Motor Replacement

The starter motor cranks your engine when you turn the key. On your BRZ it’s mounted at the top side of the transmission bellhousing, and it’s usually replaced due to slow/no cranking or an intermittent click/no-start.

Difficulty Level: Intermediate | Estimated Time: 1.5-3 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the battery negative terminal first to prevent an electrical short.
• ⚠️ Let the exhaust and engine cool before working near the starter area.
• ⚠️ Support the car with jack stands if you go underneath—never rely on a floor jack.
• ⚠️ Keep the key away from the car while working (prevents accidental cranking).

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 3/8" torque wrench
• 6" socket extension
• 12" socket extension
• Universal joint adapter
• 10mm wrench
• Trim clip removal tool
• Flathead screwdriver
• Needle-nose pliers
• 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:

• Starter motor - Qty: 1
• Battery terminal anti-corrosion spray - Qty: 1
• Dielectric grease - Qty: 1

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📋 Before You Begin

• Park on level ground, put the transmission in neutral, set the parking brake, and chock the rear wheels.
• Open the hood and keep the key/fob away from the car.
• Quick question (1 of 2): Do you have a torque wrench and want the exact Subaru torque values? If you can share your torque specs (or a photo/screenshot), I’ll plug the exact numbers into the steps.
• Quick question (2 of 2): Is your intake system stock (factory airbox and ducting), or aftermarket?

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm wrench to loosen the negative (-) battery terminal clamp.
• Lift the clamp off and tuck it aside so it can’t spring back onto the battery post.
• Tip: Wrap the clamp with a rag.

Step 2: Remove the engine under cover (if equipped)

• Raise the front with a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Use a trim clip removal tool and 12mm socket (as needed) to remove the under cover fasteners.

Step 3: Remove the intake duct and airbox (common access method)

• Use a flathead screwdriver to loosen the intake hose clamps.
• Unclip/unbolt the airbox using a 10mm socket.
• Disconnect any small hoses or connectors carefully (use needle-nose pliers for spring clamps).
• Lift the airbox assembly out to open access to the top of the transmission area.

Step 4: Locate the starter and unplug the small connector

• The starter sits at the upper side of the bellhousing where the engine meets the transmission.
• Press the tab and unplug the small starter solenoid connector by hand (or gently with needle-nose pliers).
• Tip: Don’t pull on the wires.

Step 5: Remove the main power cable from the starter

• Pull off the rubber boot covering the main power stud.
• Use a 12mm socket to remove the nut holding the battery cable to the starter.
• Move the cable aside so it cannot touch metal.
• Torque on reassembly: Torque to Subaru specification (send your spec and I’ll insert the exact value).

Step 6: Remove the starter mounting bolts

• Use a 14mm socket, 3/8" ratchet, and a 6" socket extension (add a universal joint adapter if needed) to remove the starter mounting bolts.
• Support the starter with one hand as the last bolt comes out so it doesn’t drop or bind.
• Torque on reassembly: Torque to Subaru specification (send your spec and I’ll insert the exact value).

Step 7: Remove the starter

• Wiggle the starter free from the bellhousing and lift it out from the top (most common) or guide it out as needed.
• Compare the old and new starter (mounting ears, electrical stud, connector style).

Step 8: Install the new starter

• Set the new starter into position and start the mounting bolts by hand to avoid cross-threading.
• Use a 14mm socket to snug the bolts evenly.
• Use a 3/8" torque wrench to finish tightening: Torque to Subaru specification.

Step 9: Reconnect the starter wiring

• Install the main power cable onto the stud, then tighten the nut with a 12mm socket.
• Apply a tiny amount of dielectric grease inside the rubber boot, then reinstall the boot.
• Plug in the small solenoid connector until it clicks.

Step 10: Reinstall the airbox/intake and under cover

• Reinstall the airbox and intake duct using a 10mm socket and flathead screwdriver for the clamps.
• If removed, reinstall the under cover using the trim clip removal tool and 12mm socket.
• Lower the car safely using the floor jack (rated 3-ton minimum).

Step 11: Reconnect the battery and test

• Reconnect the negative (-) battery terminal using a 10mm wrench.
• Torque on reassembly: Torque to Subaru specification (send your spec and I’ll insert the exact value).
• Start the engine and confirm strong, quick cranking.

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✅ After Repair

• Verify the engine cranks consistently hot and cold.
• Check that the starter cable boot is fully seated and not touching any hot or moving parts.
• If you removed the under cover, recheck its fasteners after a short drive.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $180-$450 (parts only)

You Save: $270-$400 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3 hours.

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🎯 Ready to get started?

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