Spark Plug Replacement
Shop Cost
~$250
DIY Parts
~$50
You Save
~$200
Tools needed (one-time, if you don't own them)~$95
🔧 Torque Spec: Spark plugs: 12-18 ft-lbs (check manual)
Tools Required (6)
Spark plug socket
Socket extension
Ratchet
Torque wrench
Gap gauge
Anti-seize
Parts & Consumables
Spark plugsDielectric grease
Pro Tip Install on cold engine only. Torque to spec.
🚗 Vehicle-Specific Notes
BMW
14mm thin-wall plug socket required. T30 Torx for coils. PB Blaster wells night before.
Extra tools: 14mm thin-wall spark plug socket, T30 Torx
Ford
Ecoboost: tight clearance. Older 5.4L Triton: plugs may BREAK in head — soak with penetrant for days.
Extra tools: Lisle broken plug extractor (5.4L)
Subaru
Boxer engine: plugs on sides, not top. Need wobble extensions. Right side tight.
Extra tools: Wobble extension set
Honda
Easy access. 5/8 plug socket. 13 ft-lbs. NGK Iridium recommended.
Toyota
Straightforward. 5/8 socket. Denso or NGK plugs. 13 ft-lbs.
Nissan
V6 models: rear bank requires intake plenum removal. Plan extra time.
Extra tools: Intake plenum gasket
Hyundai
Easy access on 4-cyl. 10mm bolt for coil. 5/8 plug socket.
❓ Common Questions
What tools do I need for a spark plug replacement?
You need 6 tools: Spark plug socket, Socket extension, Ratchet, Torque wrench, Gap gauge, Anti-seize. Parts required: Spark plugs, Dielectric grease.
How much does a spark plug replacement cost DIY vs shop?
A shop charges approximately $250. Doing it yourself costs about $50 in parts, saving you $200.
How hard is a spark plug replacement to do yourself?
Rated Easy (2/5 difficulty). Typically takes 1-2 hrs. Install on cold engine only. Torque to spec.
How often should you do a spark plug replacement?
Recommended Every 60-100K mi (approximately every 80,000 miles).
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