Parts for your 2020 Lexus Is-Ignition coils

2020 Lexus IS ignition coils — purpose, fitment, and service advice

Ignition coils are absolutely relevant to the 2020 Lexus IS. According to Lexus technical literature — including the Lexus Repair Manual (RM) and New Car Features (NCF) documents for the 8AR‑FTS 2.0‑litre turbo, the 2GR‑FKS 3.5‑litre V6, and the IS 300h’s 2.5‑litre petrol hybrid — every 2020 IS variant runs a coil‑on‑plug ignition system with one coil per cylinder. There were no diesel options in this model year, so every engine in the range uses spark ignition and therefore relies on ignition coils.

Each ignition coil transforms the 12‑volt supply into high voltage to fire the spark plug, precisely timed by the engine control unit. Being coil‑on‑plug keeps the spark strong, reduces energy losses, and helps the D‑4S fuel and ignition strategy deliver smooth power and good economy. When coils get tired, the first giveaway is usually a misfire under load, a shaky idle, or the check engine light with a P0300–P030X code.

There’s no fixed replacement interval for coils on the 2020 IS, Lexus treats them as “replace on condition”. With quality plugs and good electrics, coils often last well past 150,000–250,000 km. As part of regular servicing, it’s smart to inspect the coil boots and connectors, especially once the vehicle is over 100,000 km or if it lives in high heat. Spark plug service (typically around 96,000–120,000 km depending on engine and market guidance) is the perfect time to assess coil health.

• Common symptoms: rough idle, hard starting, loss of power, poor fuel economy, sulphur smell (raw fuel) in severe misfire.
• Quick checks: scan for P030X codes, swap a suspect coil to another cylinder to see if the fault follows, inspect for oil in plug tubes (rocker cover gasket leaks), check for cracked boots or greenish terminals.
• Prevention: keep correct iridium plugs fitted and gapped to spec, weak or worn plugs overwork coils. Ensure battery and charging system are healthy.

When replacement is needed, use high‑quality OEM or equivalent coil‑on‑plug units. On higher‑kilometre cars, replacing coils in sets can save repeat labour, but it’s not mandatory if only one is faulty. Fit coils carefully, avoid levering on the plastic bodies, seat the boots fully on the plugs, and torque the hold‑down bolts to typical Toyota/Lexus spec (about 8–10 N·m). A light smear of dielectric grease on the inside of the boot helps sealing and future removal. Driving for long with a bad coil can damage the catalytic converters, so prompt repair is well worth it.

Popular questions

Does the 2020 Lexus IS have ignition coils?
Yes. The IS 300 (8AR‑FTS 2.0‑litre turbo), IS 350 (2GR‑FKS 3.5‑litre V6), and IS 300h hybrid (2.5‑litre petrol) all use coil‑on‑plug ignition. That’s four coils on the four‑cylinder engines and six coils on the V6.

How long do ignition coils last on a 2020 IS?
With correct iridium plugs and healthy electrics, coils commonly last 150,000–250,000 km. They’re not a scheduled item, replace only if diagnostics point to a faulty unit or if age‑related cracking or misfire symptoms appear.

Is it okay to drive with a failing ignition coil?
It’s best avoided. A misfiring cylinder can overheat and contaminate the catalytic converters and may wash down cylinder walls. If a coil is failing, reduce driving and get it sorted promptly.