Parts for your 2016 Lexus Is-Ignition coils

2016 Lexus IS ignition coils — what they do, how they fail, and when to replace

Ignition coils are absolutely relevant and fitted to the 2016 Lexus IS range. Technical references including the Lexus IS Repair Manual (covering GSE3#, ASE30, AVE30 platforms) and the Toyota/Lexus Electronic Parts Catalogue confirm coil-on-plug ignition coils are used on all 2016 variants: IS200t (8AR‑FTS turbo petrol), IS300h hybrid (2AR‑FXE petrol engine within the hybrid system), and IS350 (2GR‑FSE V6 petrol). Each cylinder has its own Denso-style coil mounted directly on the spark plug.

On this model, the ignition coil’s job is to transform the 12‑volt supply into the high voltage needed to jump the spark plug gap under all loads and temperatures. Coil-on-plug designs reduce energy losses, tidy up the engine bay, and deliver precise spark control—important for the turbocharged 8AR‑FTS and the direct/port-injected 2GR‑FSE alike. When a coil weakens or fails, the engine may misfire, hesitate under load, use more fuel, and illuminate the Check Engine light with misfire or ignition primary codes.

Servicing wise, coils aren’t a scheduled replacement item, but they should be inspected whenever spark plugs are changed (typically around the 100,000 km mark, depending on engine and service schedule). A technician will look for heat-cracked housings, oil in plug tubes, swollen or carbon-tracked boots, and poor electrical connections. Any sign of arcing or water ingress under the engine cover is a cue to replace the affected coil and plug, and to renew the coil boot where separable.

If replacement is needed, quality is king—stick with OE-spec coils to maintain smooth idle and proper knock control. Coils can be replaced individually if a single cylinder is the culprit, though high‑kilometre vehicles may benefit from doing the bank or full set to avoid repeat visits. Always disconnect the battery, remove the engine cover, label connectors, and keep the plug wells clean. A light smear of dielectric grease on the inside of the boot helps sealing, avoid overdoing it. Refit with care to avoid pinching loom wiring or cracking plastic tabs, and follow the repair manual for tightening fasteners.

• Common symptoms: rough idle, stumbling on hills, reduced economy, fuel smell, and a flashing MIL under load.
• Prevention: keep water out from washing under the bonnet, fix rocker cover leaks promptly, and use the correct spark plug gap and heat range.

Popular questions about 2016 Lexus IS ignition coils

Which 2016 Lexus IS models use ignition coils?
All 2016 IS variants use coil‑on‑plug ignition coils: IS200t (8AR‑FTS), IS300h hybrid (2AR‑FXE petrol engine), and IS350 (2GR‑FSE). Each cylinder has an individual coil for precise spark control and reliability.

Should coils be replaced one at a time or as a set?
If diagnostics clearly identify one failing coil, replacing that coil and its spark plug is fine. On higher‑kilometre cars or where multiple coils show heat or tracking, replacing the bank or full set can save time and repeat labour.

What are the tell‑tale signs a coil is on the way out?
Owners may notice a rough idle, misfire under load, sluggish acceleration, higher fuel use, or a Check Engine light with misfire codes. Moisture under the cover, oil in plug tubes, or visible arcing marks on the boot are red flags during inspection.