2025 Toyota RAV4 — Spark Plug Type, Gap & Torque

Quick reference

Engine (2025 RAV4)	OEM Plug PN	Aftermarket (NGK / Denso / Motorcraft / ACDelco)	Gap (in / mm)	Torque (lb-ft / Nm)	Interval
2.5L I4 A25A-FKS (gas)	Toyota Genuine Iridium (VIN-specific; confirm in Toyota EPC)	NGK ILKAR7L11 / Denso FK20HBR11 / Motorcraft — N/A / ACDelco — N/A	0.039–0.043 in / 1.0–1.1 mm (verify, usually 1.1 mm preset)	13 lb-ft / 18 Nm (clean, dry threads)	Iridium: up to 120,000 mi (192,000 km); inspect sooner if misfire
2.5L I4 A25A-FXS (Hybrid & Prime)	Toyota Genuine Iridium (VIN-specific; confirm in Toyota EPC)	NGK ILKAR7L11 or equivalent / Denso FK20HBR11 or equivalent / Motorcraft — N/A / ACDelco — N/A	0.039–0.043 in / 1.0–1.1 mm (verify, usually 1.1 mm preset)	13 lb-ft / 18 Nm (clean, dry threads)	Iridium: up to 120,000 mi (192,000 km); inspect sooner if misfire

Why the right plug matters

Choosing the correct spark plug for your 2025 RAV4 isn’t just about thread size and reach—it’s about heat range and electrode material engineered for Toyota’s Dynamic Force 2.5L. The heat range must match Toyota’s calibration so the plug can shed heat at the proper rate. Too hot, and you risk pre-ignition and electrode erosion; too cold, and fouling and misfires creep in.

Iridium fine-wire plugs (as specified from the factory) offer the best longevity and stable spark at low coil amperage. They resist wear, help cold starts, and typically support 100k–120k mile service intervals. Platinum plugs are a step down in durability (often 60k–100k miles), while copper/nickel plugs deliver great conductivity but much shorter life (often ~30k miles) and aren’t recommended for this engine family.

How to gap a spark plug

Most Toyota iridium plugs ship "pre-gapped," but always verify.

• Use a wire or feeler gauge—not a wedge/coin style—to measure the gap. Target 1.0–1.1 mm (0.039–0.043 in) as specified for the RAV4’s 2.5L.
• If adjustment is needed, bend only the ground strap with a dedicated gapping tool. Do not pry on the fragile iridium center electrode.
• Check the gap in several places around the circumference to ensure the ground strap is parallel to the center electrode and the gauge drags with light resistance.

Replacement procedure tips (A25A-FKS / A25A-FXS)

The 2025 RAV4 uses coil-on-plug ignition—no distributor. Access is straightforward with basic hand tools.

1. Make the vehicle safe

• Gas: Key off and allow the engine to cool fully.
• Hybrid/Prime: Ensure the vehicle is OFF (not in READY). Keep the smart key at least 15 feet (5 m) away and disconnect the 12V negative terminal to prevent the engine from starting automatically. You do not need to touch HV orange cables for a spark plug service.

2. Remove engine cover and coils

• Pop off the engine cover.
• Unplug each ignition coil connector carefully (use a pick on the locking tab), remove the 10 mm coil hold-down bolts, and pull the coils straight up. Mark coil positions if desired.

3. Prepare the wells

• Blow out the plug tubes with compressed air so debris doesn’t fall into the cylinders.

4. Remove plugs

• Use a 14 mm thin-wall spark plug socket on cool aluminum heads to avoid thread damage. Break free smoothly; if resistance is high, add a small back-and-forth motion and allow more cooling time.

5. Install new plugs

• Do not use anti-seize on new iridium plugs. They are nickel-plated to prevent galling, and anti-seize will distort torque readings (over-tightening risk). If you must use it, reduce torque by ~20–30%, but Toyota recommends dry installation.
• Thread each plug in by hand using a short piece of hose or an extension to avoid cross-threading. Torque to 13 lb-ft (18 Nm) on clean, dry threads.
• Apply a small dab of dielectric grease inside each coil boot to ease future removal and improve moisture sealing. Reinstall coils and torque the 10 mm bolts snugly (approx. 62 in-lb / 7 Nm). Reconnect connectors and refit the engine cover.

6. Final checks

• Reconnect the 12V battery (hybrid/Prime) and start the engine. Verify smooth idle and no misfire codes.

Known issues for this platform

• No two-piece or extended shell plug failures as seen on Ford 3-valve V8s. The Toyota 2.5L Dynamic Force does not share that design.
• Stuck plugs are uncommon if removed on a cold engine; avoid over-torquing and anti-seize misuse which can lead to thread damage in the aluminum head.
• Coil connectors can be brittle—depress the lock fully to avoid breaking the tab. A tiny amount of dielectric grease helps the seal and future service.

Notes on part numbers and brands

• Toyota supersedes part numbers by production date and market. Always confirm the exact OEM plug part number in the Toyota Electronic Parts Catalog (EPC) using your VIN.
• Denso and NGK are the OE manufacturers for Toyota on this application. Motorcraft (Ford) and ACDelco (GM) typically do not catalog direct equivalents for the RAV4; stick with NGK/Denso for best results.

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