🔧 Altima - Ignition Coil Replacement

Your Altima uses one ignition coil per cylinder (6 total). A bad coil can cause a misfire, rough idle, flashing check-engine light, and loss of power. The front 3 coils are easy to access; the rear 3 coils usually require removing the upper intake manifold.

Difficulty Level: Intermediate | Estimated Time: 0.5–1.5 hours (front bank) / 2–4 hours (all 6)

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⚠️ Safety & Precautions

• ⚠️ Let the engine cool fully before starting.
• ⚠️ Disconnect the negative battery cable to prevent electrical damage.
• ⚠️ If the check-engine light is flashing, avoid driving (catalytic converter damage risk).
• ⚠️ Keep dirt out of the spark plug tubes (blow out debris before removing coils).

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" ratchet
• 3" extension (1/4")
• Torque wrench (inch-pound or low-range Nm)
• Flathead screwdriver
• Needle-nose pliers
• Trim clip tool
• Shop vacuum
• Compressed air blow gun
• Work light
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Ignition coil - Qty: 1–6
• Upper intake manifold gasket set - Qty: 1 (only if replacing rear-bank coils)
• Dielectric grease - Qty: 1 (optional)

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Open the hood and let the engine cool completely.
• Use a 10mm socket to disconnect the negative battery cable and isolate it so it can’t spring back.
• If you have a scan tool, note any misfire codes (P0301–P0306) so you know which cylinder is acting up.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover (if equipped)

• Remove any plastic fasteners with a trim clip tool.
• Lift the cover off and set it aside.

Step 2: Identify whether you’re doing front-bank coils or all coils

• The front bank is closest to the radiator (easier access).
• The rear bank is closest to the firewall (usually requires upper intake manifold removal).
• If you’re unsure, start with the front bank.

Step 3: Clean around the coil area

• Use a shop vacuum to remove loose dirt around the coils.
• Use compressed air blow gun to blow debris away from the spark plug tubes.

Step 4: Unplug the ignition coil electrical connector

• Press the connector lock tab and pull straight back.
• If it’s stuck, gently help it with a flathead screwdriver (do not pry hard on the wires).

Step 5: Remove the coil hold-down bolt

• Use a 10mm socket, 1/4" ratchet, and 3" extension to remove the bolt.
• Set the bolt somewhere safe (dropping it can be a headache).

Step 6: Remove the ignition coil

• Twist the coil slightly by hand, then pull it straight up and out.
• If it’s stubborn, keep twisting while pulling—don’t use excessive force.

Step 7: Install the new ignition coil

• If using dielectric grease: apply a tiny smear inside the rubber boot. (Dielectric grease is a non-conductive grease that helps prevent moisture and makes future removal easier.)
• Push the new coil straight down until it fully seats on the spark plug.

Step 8: Reinstall the coil bolt and torque it

• Thread the bolt by hand first to avoid cross-threading.
• Tighten with a 10mm socket and finish with a torque wrench.
• Torque to 7.8 Nm (69 in-lbs)

Step 9: Reconnect the electrical connector

• Push the connector on until it clicks.
• Give it a gentle tug to confirm it’s locked.

Step 10: Repeat for the other accessible coils (front bank)

• Repeat Steps 3–9 for each front-bank cylinder you’re replacing.

Step 11: Rear-bank coils (only if you’re doing all 6)

• Accessing the rear bank typically requires removing the upper intake manifold.
• If you want, tell me: Are you replacing all 6 coils or only the bad one(s)? I’ll give you the exact rear-bank access steps next, including gasket handling and reassembly checks.

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✅ After Repair

• Reconnect the negative battery cable using a 10mm socket.
• Start the engine and let it idle for 1–2 minutes. It should run smooth.
• If you had a check-engine light, clear codes with a scan tool (if available) and recheck for returning misfire codes.
• Do a short test drive and confirm there’s no hesitation under light acceleration.

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💰 DIY vs Shop Cost

Shop Cost: $350-$900 (parts + labor)

DIY Cost: $45-$420 (parts only, depending on 1 vs 6 coils)

You Save: $200-$500 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-3 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.