2012–2020 Chevrolet Sonic
By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $335 by doing it yourself! Shop cost: $450
Quick answer: Spark Plug Replacement on a 2012–2020 Chevrolet Sonic is rated Advanced and takes about 1-3 hours. You'll need 5 tools for this job, and parts cost about $115. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Correct spark plug set for the gasoline/ICE engine in 2012-2020 Chevrolet Sonic; verify engine, heat range, gap, and VIN fitment | — | $115.00 | |
| Coil-boot seals or ignition coils only if inspection finds damage Optional | — | $35.00 |
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
Follow these steps carefully
The 1.8L LUW takes NGK IFR6Z7G (stock #95609), gapped at 0.028 in — buy 4. The 1.4L turbo LUV takes ACDelco 41-121 (NGK IFR7X7G, stock #91039), also gapped at 0.028 in — buy 4. Both use a 5/8 in hex.
Let the engine cool and disconnect the negative battery cable. On the 1.4T you'll find one long coil strip covering all four plugs, held by two T-30 Torx screws; on the 1.8L there are four individual coils. Either way, access is right on top.
The plug boot should click or seat firmly. I feel for positive engagement — loose boots arc. For iridium plugs, I don't adjust the gap aggressively. The fine wire bends easily.
On the 1.4T, slide the purple lock tab back on the coil strip's connector, squeeze the release, and lift the whole strip straight up. On the 1.8L, unplug each coil and remove its bolt.
Remove the old plugs with a 5/8 in spark-plug socket and compare reach and wear. Start each new plug by hand and tighten to the manufacturer's spec in your owner's manual. NGK's trivalent plating means no anti-seize. Verify the 0.028 in gap with a wire gauge on either engine — do not pry on finewire tips.
Reinstall the coil strip (or individual coils), torque the T-30 screws, and reconnect the harness — click the purple lock home. Refit the cover and battery cable, start the Sonic, and scan for misfires. Both engines should idle evenly and accelerate without stumble.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2012–2020
2012–2020
2012–2020
2012–2020
2012–2020
2012–2020
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