🔧 Altima - Starter Motor Replacement

The starter motor cranks the engine when you turn the key or press start. On your Altima, the starter is mounted low on the engine/transmission area and is accessed from underneath, so safe lifting is the most important part of this job.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before touching the starter wiring. The large starter cable is always battery-powered.
• ⚠️ Let the engine and exhaust cool completely before working underneath.
• ⚠️ Support your Altima with jack stands. Never work under a vehicle supported only by a floor jack.
• ⚠️ Wear safety glasses. Dirt and debris can fall while working under the car.
• ⚠️ Keep the ignition OFF and key away from the vehicle while the starter is disconnected.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm wrench
• 10mm socket
• 12mm socket
• 13mm socket
• 14mm socket
• 3/8-inch ratchet
• 3/8-inch extension set
• Torque wrench 10-80 ft-lbs
• Flat-blade screwdriver
• Trim clip removal tool
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Wheel chocks
• Nitrile gloves
• Safety glasses
• Work light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Starter motor - Qty: 1
• Starter electrical terminal nut - Qty: 1, if corroded or damaged
• Under-engine splash shield clips - Qty: As needed

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📋 Before You Begin

• 🚗 Park your Altima on level ground and set the parking brake.
• 🚗 Place wheel chocks behind the rear wheels.
• 🔋 Disconnect the negative battery cable using a 10mm wrench. A battery cable is the thick wire connected to the battery post.
• ⏱️ Wait at least 2 minutes after disconnecting the battery before working near starter wiring.
• 💡 Take a phone photo of the starter wiring before removal so you can reconnect it the same way.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Support the Front

• Use wheel chocks behind both rear wheels.
• Use a floor jack rated 2-ton minimum at the front center jacking point to lift the front of your Altima.
• Place jack stands rated 2-ton minimum under the front side pinch welds or approved support points.
• Gently lower the car onto the jack stands and lightly shake the vehicle to confirm it is stable.
• Never trust the jack alone.

Step 2: Remove the Lower Splash Shield

• Put on safety glasses before working under the car.
• Use a trim clip removal tool to remove the plastic push clips from the lower splash shield. A trim clip tool is a small fork-shaped tool that lifts plastic fasteners without breaking them.
• Use a 10mm socket and 3/8-inch ratchet to remove any 10mm splash shield bolts.
• Lower the splash shield and set it aside.

Step 3: Locate the Starter Motor

• Use a work light and look toward the lower engine/transmission joint area.
• The starter is a small cylindrical motor with a large battery cable and a smaller control connector attached to it.
• Use a flat-blade screwdriver only if needed to gently move wiring retainers out of the way.
• Take a photo before unplugging wires.

Step 4: Disconnect the Starter Electrical Connections

• Confirm the negative battery cable is already disconnected using a 10mm wrench.
• Use a flat-blade screwdriver to gently release the small starter control connector lock, then unplug the connector.
• Use a 12mm socket or 13mm socket with a 3/8-inch ratchet to remove the nut from the large starter battery cable terminal.
• Move the cable away from the starter so it cannot touch the terminal.
• Do not pull on the wires themselves. Pull on the connector body.

Step 5: Remove the Starter Mounting Bolts

• Support the starter with one hand before removing the final bolt. It is heavier than it looks.
• Use a 14mm socket, 3/8-inch ratchet, and 3/8-inch extension set to remove the starter mounting bolts.
• Carefully slide the starter away from the transmission housing and lower it out of the vehicle.
• If it feels stuck, gently wiggle it by hand. Do not pry against the aluminum transmission case.

Step 6: Compare the Old and New Starter

• Place both starters side by side on a clean surface.
• Check that the mounting ears, electrical terminals, and gear position match.
• Use a clean nitrile-gloved hand to wipe dirt away from the mounting surface.
• Do not grease the starter gear unless the replacement starter instructions specifically say to.

Step 7: Install the New Starter

• Lift the new starter into position by hand.
• Start the mounting bolts by hand first to avoid cross-threading.
• Use a 14mm socket, 3/8-inch extension set, and 3/8-inch ratchet to snug the bolts evenly.
• Use a torque wrench 10-80 ft-lbs and 14mm socket to tighten the starter mounting bolts to Torque to 49 Nm (36 ft-lbs).

Step 8: Reconnect the Starter Wiring

• Reconnect the large battery cable to the starter terminal.
• Use a 12mm socket or 13mm socket with a torque wrench 10-80 ft-lbs to tighten the terminal nut to Torque to 9 Nm (80 in-lbs).
• Reconnect the small starter control connector until it clicks.
• Use a flat-blade screwdriver only if needed to reseat any wiring retainers.
• Make sure no wiring is touching the exhaust or hanging near moving parts.

Step 9: Reinstall the Lower Splash Shield

• Raise the splash shield into position by hand.
• Use a trim clip removal tool or your fingers to reinstall the plastic push clips.
• Use a 10mm socket and 3/8-inch ratchet to reinstall any 10mm bolts.
• Snug the splash shield bolts only. Do not overtighten plastic shield hardware.

Step 10: Lower the Vehicle and Reconnect the Battery

• Use a floor jack rated 2-ton minimum to lift the front slightly off the jack stands.
• Remove the jack stands rated 2-ton minimum.
• Lower the vehicle slowly with the floor jack rated 2-ton minimum.
• Reconnect the negative battery cable using a 10mm wrench.
• Tighten the battery terminal snugly so it does not twist by hand.

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✅ After Repair

• ✅ Start your Altima and listen for a normal, strong crank.
• ✅ If the engine does not crank, stop and recheck the battery cable, starter cable, and small control connector.
• ✅ Confirm the battery warning light turns off after the engine starts.
• ✅ Reset the clock and radio presets if they changed after battery disconnect.
• ✅ Test start the vehicle 2-3 times, waiting a few seconds between attempts.

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💰 DIY vs Shop Cost

Shop Cost: $450-$800 (parts + labor)

DIY Cost: $180-$380 (parts only)

You Save: $270-$420 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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