2015–2023 Dodge Challenger
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 2015–2023 Dodge Challenger is rated Advanced and takes about 1-3 hours. You'll need 4 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 2015-2023 Dodge Challenger; 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
Confirm your Challenger's exact engine before ordering — the 5.7L HEMI needs SIXTEEN plugs (two per cylinder), the 3.6L V6 six. Check both plugs on each cylinder when chasing a misfire. Scan for codes first and note the flagged cylinder.
Release each coil connector by its locking tab — pull the connector body, never the wiring. Work the rear cylinders with the hood fully open; the cowl crowds cylinders 7 and 8.
Pull each coil straight up and set the eight coils aside in firing-order sequence so every coil returns to its own cylinder. Inspect each boot for cracks and carbon tracking.
I label upper versus lower per cylinder as they come out — the two plugs in one hole wear differently, and I've learned if I'm chasing a misfire, mixing them up destroys my whole comparison.
Never use an impact. Tighten to the owner's-manual spec; the crush washer seats with a distinct increase in resistance. Don't re-gap the pre-set iridium tips and skip anti-seize on plated threads.
Seat every coil and lower-plug boot fully — a boot that is not clicked down arcs and sets a misfire within days — reinstall the hold-down bolts, and reconnect each coil connector until it locks. Refit the engine cover. Start the Challenger and confirm a smooth idle with no check-engine light, then scan for misfire codes (P0300-P0308) after a drive that includes acceleration; the HEMI exposes a weak coil under load. Stop and recheck if any thread bound during installation or if a misfire code returns on one cylinder.
The HEMI finds weak coils under load — it can idle perfectly and misfire at wide-open throttle. I always include an acceleration run before I call this job done.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2015–2023
2015–2023
2015–2023
2015–2023
2015–2023
2015–2023
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