🔧 Impreza - Starter Motor Replacement

The starter motor cranks the engine when you turn the key/push the start button. If it’s failing, you may get a single click, slow cranking, or intermittent no-start. On your Impreza, the starter sits on top of the transmission bellhousing and is usually accessed from the engine bay.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the battery negative terminal first to prevent a short.
• ⚠️ Keep metal tools away from the positive battery cable at all times.
• ⚠️ Work on a cool engine; the starter area can be near hot components.
• ⚠️ Set the parking brake and keep the shifter in Park.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Fender cover
• 10mm socket
• 12mm socket
• 14mm socket
• 3/8" ratchet
• 3/8" torque wrench (10–80 Nm range)
• 3/8" extension set (3", 6", 10")
• 3/8" wobble extension
• Flat-blade screwdriver
• Needle-nose pliers
• Trim clip tool
• Magnetic pickup tool
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

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

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📋 Before You Begin

• Park on level ground, turn ignition OFF, and open the hood.
• Have your radio presets noted if you care about them.
• Disconnect the battery: use a 10mm socket to remove the negative terminal first, then isolate it so it can’t spring back.
• “Bellhousing” = where engine meets transmission.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect and remove the battery

• Use a 10mm socket to loosen and remove the negative (-) battery terminal. Torque to 7.5 Nm (5.5 ft-lbs) on reassembly.
• Use a 10mm socket to loosen and remove the positive (+) terminal, then cover it so it can’t touch metal. Torque to 7.5 Nm (5.5 ft-lbs) on reassembly.
• Use a 10mm socket to remove the battery hold-down hardware, then lift the battery out.

Step 2: Remove the intake ducting/air box pieces for access

• Use a flat-blade screwdriver to loosen the intake hose clamp(s) as needed.
• Use a trim clip tool to pop any plastic clips holding the snorkel/duct.
• Use a 10mm socket and 12mm socket to remove air box bolts if they block access, then move the assembly aside.
• Take a quick photo before removing hoses.

Step 3: Locate the starter and label the wiring

• Look at the top of the transmission where it meets the engine; the starter is a small motor with a solenoid (the “bump” on it).
• Use a work light to clearly see the electrical connections.
• Use needle-nose pliers to remove any small retaining clip (if equipped) and gently pull off the small trigger wire connector.

Step 4: Remove the starter electrical connections

• Use a 12mm socket (commonly) to remove the nut holding the main battery cable to the starter solenoid stud.
• Move the cable aside and keep it from touching metal parts.
• Apply a thin film of dielectric grease to the small trigger connector during reassembly.

Step 5: Remove the starter mounting bolts

• Use a 14mm socket, 3/8" ratchet, and extension set (and a wobble extension if needed) to remove the starter mounting bolts.
• Support the starter with your free hand as the last bolt comes out.
• Torque to 39 Nm (29 ft-lbs) on reassembly.
• Use a magnetic pickup to avoid dropped bolts.

Step 6: Remove the starter from the bellhousing

• Wiggle the starter straight out of the bellhousing opening by hand.
• Compare the old and new starter (mounting ears and electrical studs) before installing.

Step 7: Install the new starter

• Position the starter into the bellhousing opening by hand.
• Start both mounting bolts by hand first (prevents cross-threading).
• Use a 14mm socket and 3/8" torque wrench to tighten the mounting bolts. Torque to 39 Nm (29 ft-lbs)

Step 8: Reconnect starter wiring

• Install the main battery cable onto the starter solenoid stud and tighten the nut using a 12mm socket.
• Push the small trigger connector back on until it fully seats.
• Apply battery terminal anti-corrosion grease to the battery terminals during reassembly.

Step 9: Reinstall intake parts and the battery

• Reinstall the air box/ducting using the 10mm socket and 12mm socket as removed.
• Tighten intake clamps using a flat-blade screwdriver (snug, do not strip).
• Reinstall the battery hold-down using a 10mm socket.
• Reconnect battery terminals: positive first, negative last using a 10mm socket. Torque to 7.5 Nm (5.5 ft-lbs)

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✅ After Repair

• Turn ignition ON (do not start) and confirm no warning lights appear abnormally.
• Start the engine and verify strong, fast cranking with no clicking.
• Listen for abnormal grinding; if present, shut down and re-check starter seating and bolts.
• Recheck that the intake hose clamps are tight and there are no vacuum leaks (rough idle can indicate a loose hose).

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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 1.5-2.5 hours.

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🎯 Ready to get started?

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