Parts for your 2019 Lexus Is-Ignition coils

2019 Lexus IS ignition coils — what they do, why they matter, and when to replace them

The 2019 Lexus IS absolutely uses ignition coils. Technical Lexus/Toyota sources describe a Direct Ignition System (DIS) with coil-on-plug units and built‑in igniters for both engines fitted to this model year. The 8AR‑FTS 2.0L turbo four uses one coil per cylinder (4 total), and the 2GR‑FKS 3.5L V6 uses one per cylinder (6 total). This design is detailed in Lexus/Toyota Repair Manual sections covering “Engine Control – Direct Ignition System” for the 8AR‑FTS and 2GR‑FKS engines, and supported by diagnostic coverage for ignition coil circuits (e.g., P0351–P0356) in the official service literature.

Each coil’s job is to step battery voltage up to tens of thousands of volts and deliver a crisp spark directly at the plug. Coil-on-plug setups ditch traditional leads, improving spark energy, timing accuracy, cold-start performance, fuel economy, and emissions — all the things a modern Lexus IS owner expects from a refined petrol engine.

On a 2019 Lexus IS, coils aren’t a routine replacement item, they’re serviced on condition. Telltale signs a coil is giving up include a rough idle, hesitation under load, poor fuel economy, and a check engine light with misfire codes. A quick scan of misfire counters, followed by a swap test (moving a suspect coil to another cylinder to see if the fault follows) is a common and effective diagnostic approach. Pros may also use an oscilloscope to view coil primary patterns, but the units themselves aren’t serviceable internally.

Smart servicing pairs coil checks with scheduled spark plug replacement per the factory maintenance schedule. During plug changes, inspect coil boots for hardening, tears, or carbon tracking, and keep plug tubes clean and dry. A tiny smear of dielectric grease on the inside of the boot helps future removal and seals out moisture. When refitting, seat coils squarely and tighten fasteners to factory torque. Always use quality OE‑grade parts (Lexus/Toyota, Denso, etc.) and avoid mixing old and new plugs or coils on the same bank if chasing a persistent misfire. If the vehicle has clocked high kilometres and multiple coils show intermittent faults, replacing them as a set can save time and future labour. Lastly, healthy battery voltage and clean engine grounds help coils live a long, quiet life under the bonnet.

• Engine coverage: 8AR‑FTS (4 coils) and 2GR‑FKS (6 coils), coil‑on‑plug with built‑in igniters per Lexus/Toyota Repair Manual.

Popular questions about 2019 Lexus IS ignition coils

How many ignition coils does a 2019 Lexus IS have?
It depends on the engine. The 2.0L turbo four (8AR‑FTS) has four coils, one per cylinder. The 3.5L V6 (2GR‑FKS) has six coils. Either way, it’s a coil-on-plug setup, so there are no traditional high‑tension leads to replace.

Should ignition coils be replaced as a set?
They don’t have to be. Coils are typically replaced only when faulty. That said, on higher‑kilometre cars or when multiple coils are marginal, replacing the full set can prevent repeated visits and duplicated labour. Match this decision to the vehicle’s age, budget, and diagnostic findings.

What are the common symptoms of a failing coil on a 2019 IS?
Expect rough idle, misfire under load, hesitation, reduced fuel economy, and a check engine light. A scan tool will usually show misfire counts and may log an ignition coil circuit code. If the symptom moves when you swap coils between cylinders, the coil is the likely culprit.