Parts for your 2017 Lexus Is-Coil springs

2017 Lexus IS coil springs: what they do and when to replace them

Coil springs are absolutely used on the 2017 Lexus IS. Technical sources confirm it: the Lexus IS (XE30) Repair Manual on Toyota’s Technical Information System lists front and rear coil springs for all 2017 IS variants (IS200t/300/350, including F Sport and models with Adaptive Variable Suspension). The Lexus Electronic Parts Catalogue also shows dedicated part numbers for front springs (48131-xxxxx series) and rear springs (48231-xxxxx series). The platform runs a front double-wishbone and rear multi-link setup, with coil-over dampers up front and separate rear coil springs paired to dampers, depending on spec. No air suspension is fitted from factory on this model.

On this car, the coil springs set ride height, support the vehicle’s weight, and keep everything poised over Aussie and Kiwi roads. They soak up bumps, help the shocks control body movement, and work with the geometry to deliver the IS’s tidy turn-in and surefooted mid-corner stability. Different trims can have different rates, for example, F Sport springs are typically a touch firmer for sharper response, while AVS changes damper force, not the spring itself.

They don’t need routine replacement on a time basis, but they do benefit from inspection. During regular servicing or any time the wheels are off, it’s smart to check for chipped paint, corrosion pitting, fractured coils (often at the ends), uneven ride height, and rubber insulators that are perished. If one spring has failed or sagged, replace in axle pairs to keep handling balanced. After spring work, a wheel alignment is a must to protect tyres and steering feel.

Typical replacement triggers include a noticeable drop on one corner, clunks over bumps, wayward handling, or visible damage. On higher-mileage cars (say 100,000–150,000 km+), fatigue or rust in harsher climates can creep in. Use quality springs matched to the exact VIN and option package—mixing rates can upset ABS/ESC behaviour and tyre wear. Never heat, cut, or clamp a spring, proper compression tools and procedures from the Lexus repair manual should be followed. While you’re there, consider renewing top mounts, bearings, insulators and bump stops, and always torque fasteners to spec.

• Watch for: uneven ride height, knocking noises, rapid tyre wear, floaty or bouncy ride.
• Best practice: replace in pairs, align afterwards, and pair springs with healthy dampers.

Looked after, the IS’s coil springs help keep the ride comfy and the handling crisp, just as Lexus intended.

FAQs

Does the 2017 Lexus IS have coil springs or air suspension?
All 2017 Lexus IS models use steel coil springs. There’s no factory air suspension option for this generation. Models with Adaptive Variable Suspension use electronically controlled dampers, but still rely on conventional coil springs to support the vehicle.

How often should coil springs be replaced on a 2017 IS?
There’s no fixed interval. Replace when they’re broken, heavily corroded, or sagging, or if ride height is uneven. On higher-kilometre cars or those driven on rough roads, proactive inspection during services is wise, and springs should be replaced in axle pairs for best balance.

Is it safe to drive with a broken coil spring?
It’s not recommended. A broken spring can alter ride height and geometry, harming braking and cornering, and may damage tyres or other suspension parts. Arrange repair promptly and have an alignment done after replacement.