Parts for your 2005 Toyota Highlander-Spark plugs

2005 Toyota Highlander spark plugs

Yes — a 2005 Toyota Highlander (known as Kluger in Aus/NZ) uses spark plugs. Both factory engines for that model year — the 2.4L 2AZ‑FE inline‑four and the 3.3L 3MZ‑FE V6 — are petrol, spark‑ignition engines. Toyota’s 2005 Highlander Owner’s Manual maintenance schedule and Toyota repair manual specs call for iridium spark plugs with a 1.1 mm gap and a long replacement interval, confirming they’re absolutely relevant on this vehicle.

Spark plugs ignite the compressed air–fuel mix inside each cylinder, so the engine fires cleanly, starts easily under the bonnet on cold mornings, and delivers smooth power and decent fuel economy. Iridium plugs (Toyota typically specifies Denso SK20R11 or equivalent NGK IFR6A11/IFR5A11 depending on engine) are fitted from factory for longevity and stable spark at wide gaps.

As part of servicing, it’s smart to treat spark plugs as “fit and forget” until the scheduled interval — then replace the lot together. Toyota’s schedule for the 2005 Highlander sets replacement at about 120,000 miles (192,000 km) or 96 months for the iridium plugs. If the Highlander does lots of short trips, tows, or sees dusty conditions, checking earlier won’t hurt.

Handy tips when replacing on a 2005 Highlander:

• Use the correct iridium plugs, pre‑gapped to 1.1 mm