Parts for your 2007 Lexus Is-Ignition coils

2007 Lexus IS ignition coils: what they do and when to replace them

Based on Lexus/Toyota technical sources — including the Lexus New Car Features (NCF) and Repair Manual for the 4GR‑FSE (IS 250) and 2GR‑FSE (IS 350), plus the Toyota Electronic Parts Catalogue (EPC) listings for individual coil‑on‑plug assemblies — the 2007 Lexus IS petrol models are fitted with ignition coils (one per cylinder). By contrast, the IS 220d (2AD‑FHV) diesel offered in some markets uses compression ignition with glow plugs, not ignition coils, this is confirmed in the Toyota 2AD service literature. In Australia and New Zealand, the 2007 IS range is primarily petrol, so ignition coils are relevant for local cars.

On the 2007 Lexus IS 250/350, each cylinder gets its own coil‑on‑plug unit. Their job is simple but vital: take the 12‑volt supply and transform it into the high voltage needed to jump the spark plug gap, lighting the air‑fuel mix cleanly under load and across the rev range. Healthy coils mean smooth idle, crisp throttle response, strong fuel economy, and lower emissions.

They’re not a scheduled “service item” like oil or filters, but they do age from heat and vibration. As part of routine servicing, it’s smart to check coil connectors, look for cracking or carbon tracking on the boots, and make sure there’s no oil in the plug tubes from a cam cover leak. If misfire codes appear (P030x or P035x), or there’s a rough idle, hesitation, or poor fuel economy, a weak coil could be the culprit.

• Typical signs a coil needs attention: hard starts, flashing MIL, sulphury exhaust smell, or a noticeable stumble under load.
• Good practice every 40,000–60,000 km: inspect coil boots, verify plug condition and gap, and scan for pending misfire codes.
• Always pair coil checks with fresh, correct‑spec iridium plugs at the recommended interval, worn plugs overwork coils.

Replacement is straightforward: disconnect the battery, lift the engine cover, unplug the coil, remove the small retaining bolt, and swap the unit. Lightly apply dielectric grease to the boot if recommended, seat the coil squarely, and tighten the bolt to factory spec (around 8 N·m, confirm in the service manual). Refit connectors securely. For spark plugs, torque is typically in the high‑teens N·m range for these engines, again, follow the exact service data. Use quality genuine or OEM‑equivalent coils to keep the V6 purring, and clear fault codes after the job. If your IS happens to be the diesel IS 220d, skip coils altogether — its glow plug system is the relevant item to test and maintain.

How many ignition coils does a 2007 Lexus IS have?

Petrol models use one coil per cylinder. That means six coils on the IS 250 and IS 350. If the vehicle is an IS 220d diesel (rare in AU/NZ), there are no ignition coils at all — it uses glow plugs instead.

When should the ignition coils be replaced on a 2007 IS?

There’s no fixed kilometre interval. Coils are replaced when symptoms or diagnostics point to a fault — think misfire codes, rough running, or poor fuel economy. Many owners proactively replace any weak coil during a plug change to avoid repeat labour later.

Can a bad spark plug damage a coil on an IS 250/350?

Yes. Excessive plug gap or a degraded plug insulator makes the coil work harder, increasing heat and stress. Keeping the correct iridium plugs in good nick helps coils last longer and keeps the V6 smooth and efficient.