Parts for your 2007 Toyota Vitz|yaris-Ignition coils

2007 Toyota Vitz/Yaris ignition-coils

Based on Toyota’s factory repair manuals for the P9-platform Vitz/Yaris (KSP90/SCP90/NCP91), the Toyota Electrical Wiring Diagram for these models, and Denso/NGK ignition component catalogues, the 2007 Toyota Vitz/Yaris petrol variants do use ignition-coils in a coil-on-plug setup. The 1.0-litre 1KR-FE, 1.3-litre 2SZ-FE, and 1.5-litre 1NZ-FE engines each have one coil per cylinder, controlled by the engine ECU. Only the 1.4 D-4D (1ND-TV) diesel does not use ignition coils, as diesels rely on compression ignition and glow plugs rather than spark ignition.

For a 2007 Vitz/Yaris on petrol, ignition-coils are the little transformers that turn the battery’s 12 volts into tens of thousands of volts to jump the spark plug gap. In this model they sit right on top of each plug (coil-on-plug), doing away with old-school leads and distributors for cleaner, more reliable spark delivery. When they’re healthy, you’ll get smooth starts, decent fuel economy, and crisp throttle response around town and on the open road.

Because they live in a hot well and cop plenty of vibration, ignition-coils can tire out with age and kilometres. Tell-tales include a rough idle, hesitation under load, poor fuel economy, and a check engine light with codes like P0300–P0304 (misfires) or P0351–P0354 (coil circuit). On this Toyota, a quick swap test—moving a suspect coil to another cylinder and seeing if the misfire follows—helps nail the culprit without guesswork.

Good servicing habits go a long way. Keep to the scheduled spark plug interval (iridium plugs are typically due around the 100,000 km mark). Worn plugs make coils work harder, shortening their life. When the coils are out, inspect the rubber boots for cracks, carbon tracking, or oil in the plug tubes (a cam cover seal weep will cook coils if ignored). Refit the coils clean and dry, seat them firmly, and nip the 10 mm retaining bolts to spec (around 8–9 N·m). Avoid blasting the engine bay with high-pressure water—moisture in the plug tubes can set off misfires.

If one coil has failed on a high‑kilometre car, it’s fine to replace just that unit, but many owners in Australia and New Zealand opt to refresh the full set to avoid serial misfires. Stick with quality OEM-spec (often Denso on these Toyotas), clear the codes after the job, and the little Yaris/Vitz will be back to its cheerful best.

• Common symptoms: rough idle, hesitation, poor fuel use, check engine lamp.
• Typical fault codes: P0300–P0304, P0351–P0354.
• Service tip: change plugs on time, check for oil or moisture in plug tubes.

How many ignition coils does a 2007 Toyota Vitz/Yaris have?
On petrol models, it runs a coil-on-plug setup: three coils on the 1.0‑litre 1KR‑FE and four coils on the 1.3 2SZ‑FE and 1.5 1NZ‑FE. The 1.4 D‑4D diesel uses no ignition coils (it uses glow plugs).

Should all coils be replaced at once?
Not strictly. Replacing the single faulty coil is fine, especially on lower‑kilometre cars. If the vehicle has high kilometres and the coils are original, replacing the set can prevent repeat visits as the others age out.

What’s the best way to diagnose a bad coil on this Toyota?
Scan for codes, then do a swap test—move the suspect coil to another cylinder and see if the misfire follows. Inspect the boot and plug condition while you’re there, tired plugs or oil in the tube can mimic a coil fault.