2014–2019 Toyota Corolla

2014-2019 Toyota Corolla - Ignition Coils

By Tom Becker ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026

🔧🔧 Moderate 1-2 hours $75 DIY

Save $275 by doing it yourself! Shop cost: $350

Quick answer: Ignition Coils on a 2014–2019 Toyota Corolla is rated Moderate and takes about 1-2 hours. You'll need 4 tools for this job, and parts cost about $75. This guide walks you through the full job step by step, including the mistakes to avoid.

Quick Video Tutorial

Parts You Need

Total Cost

$75.00

Part Name	Part Number	Price	Buy
Replacement ignition coil; verify engine, cylinder, and connector by VIN	—	$75.00	Amazon

About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

Confirm the misfire diagnosis

Scan for DTCs and identify the cylinder. Inspect the spark plug, coil boot, connector, harness, injector, intake leaks, and compression before condemning the coil; swap-test only when safe and appropriate.

Cool the engine and prepare safely

Park on level ground, set the parking brake, switch the ignition off, let the engine cool, and disconnect the negative battery cable if required by the service procedure. Keep clear of EV/high-voltage parts.

Remove covers and gain access

Remove the engine cover, intake duct, or other access pieces needed to reach the ignition coils. On V6 engines, follow the engine-specific procedure for any upper intake manifold or rear-bank access.

Disconnect the coil

Photograph the coil layout. Press the connector lock and unplug the suspect coil without pulling on the wires. Blow debris away from the coil and bolt before removal.

Remove the old coil

Remove the coil retaining bolt with the correct socket, then twist and lift the coil straight out. Inspect the boot, plug well, connector, and nearby wiring for oil, moisture, cracking, or carbon tracking.

Install and torque the replacement

Compare the new coil with the removed part, apply only a small amount of dielectric grease inside the boot if specified, seat it fully over the spark plug, start the bolt by hand, and tighten to the exact engine-specific torque.

🔧 Mechanic's note — Ray Delgado

A little dielectric grease in the boot goes a long way — but only a little, because I've learned too much means the coil floats on the plug instead of seating.

Reconnect and verify operation

Reconnect the coil connector until it locks, reinstall all covers and intake parts, reconnect the battery if disconnected, clear codes only after recording them, start the engine, and road-test while checking for repeat misfire codes.

🔧 Mechanic's note — Tom Becker

I clear the codes only after writing them down — the freeze-frame data tells me the conditions of the misfire, and I've learned I'll want it if the code comes back.

All Done!

Test your repair before closing everything up. If something doesn't work right, double-check your steps.

⚠️ Common Mistakes to Avoid

• Replacing a coil without scanning codes and confirming the misfire follows the coil
• Ordering the wrong coil for the engine, bank, or cylinder
• Pulling on a connector wire or mixing up connectors
• Dropping dirt into a spark-plug well or leaving the coil boot unseated
• Over-torquing the small coil bolt or ignoring a damaged spark plug and wiring

Tools You'll Need

Metric socket set, ratchet, and extensions Torque wrench and small trim tool or pick Compressed air or a clean brush for plug wells Dielectric grease and flashlight Scan tool or code reader Safety glasses and gloves

Related Trouble Codes

P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected

⚠️ Safety First!

• Informational DIY. EZ Car Fix is not a shop.
• Only use this procedure on the gasoline ICE version of the 2014-2019 Toyota Corolla; do not apply it to an EV or any high-voltage component.
• Let the engine cool, switch the ignition off, and disconnect the negative battery cable before handling coil wiring when the service procedure calls for it.
• Verify the failed cylinder and exact engine before ordering parts; a misfire can also be caused by a spark plug, injector, wiring, vacuum leak, or compression problem.
• Keep dirt out of the plug wells and do not over-torque the coil fastener; confirm the engine-specific torque before final tightening.