Parts for your 2017 Toyota Rav4-Ignition coils

2017 Toyota RAV4 ignition coils — what they do and when to replace them

Based on technical references — Toyota Repair Manual (TIS) for the 2016–2018 RAV4 ignition system, the Toyota Electronic Parts Catalogue, and aftermarket catalogues from DENSO/NGK as well as the Haynes RAV4 manual — the 2017 Toyota RAV4 petrol and hybrid variants use four coil‑on‑plug ignition coils (one per cylinder). Diesel variants offered in some markets don’t use ignition coils because diesel combustion relies on compression ignition and glow plugs rather than a spark.

On the petrol and hybrid RAV4, each ignition coil transforms the battery’s 12 volts into the high voltage needed to jump the spark plug gap and ignite the air‑fuel mix. Being coil‑on‑plug, they sit directly over the plugs for a clean spark, fewer leads, and better reliability. When they’re healthy, starting is crisp, fuel economy stays tidy, and the engine runs smooth as.

Ignition coils aren’t a routine replacement item in the service schedule, but they do age with heat and vibration. Most owners only touch them when changing spark plugs (typically around the 120,000 km mark for iridium plugs), or when there’s a misfire. If a coil plays up, it’ll usually trigger a Check Engine Light and a fault code such as P0351–P0354, along with a rough idle, hesitation, or higher fuel use.

Good practice during servicing is to inspect coil boots for hardening or cracking, check for oil in the plug tubes (a cam cover seal issue), and make sure the coils are seated firmly on the plugs. If one coil fails at high kilometres, it’s fine to replace just the dud, but many workshops in Australia and New Zealand will test the rest and recommend replacing any weak mates to keep things drama‑free.

• Symptoms of a crook coil: rough idle, stumble under load, poor fuel economy, hard starts, or a sulphur smell from the cat after misfires.
• Basic care: use quality plugs gapped to spec, avoid pressure‑washing the top of the engine, and keep connectors clean and pinned tight.
• Fitting tips: disconnect the battery, remove the coil retaining bolt, lift the coil straight up, and refit with a light smear of dielectric grease on the boot. Tighten fasteners to the torque specified in the Toyota repair manual.

Popular question: How many ignition coils are on a 2017 RAV4?

Petrol and hybrid models have four coil‑on‑plug ignition coils — one per cylinder. Diesel variants have none, as they use compression ignition with glow plugs instead of spark ignition.

Popular question: When should the ignition coils be replaced?

There’s no fixed interval. Replace coils when diagnostic testing confirms a fault or when misfire symptoms point to a weak coil. It’s smart to inspect coils whenever the spark plugs are changed and renew any boots that are cracked or stiff.

Popular question: Is it safe to keep driving with a failing coil?

It’s not recommended. Ongoing misfires can damage the catalytic converter and other components. If the RAV4 is missing, drive gently to a workshop and get the fault scanned and sorted promptly.