Parts for your 2004 Lexus Is-Engine mount

2004 Lexus IS Engine Mounts

Engine mounts are absolutely fitted to the 2004 Lexus IS. Technical references that confirm this include the Lexus IS200/IS300 Repair Manual (1999–2005) sections covering Engine Mounting and Drivetrain, the Toyota/Lexus Electronic Parts Catalogue (EPC) which lists “Insulator, Engine Mounting, RH/LH” for the 2004 IS (XE10), and independent guides such as the Haynes manual for Lexus IS 1999–2005. These sources show the car uses two primary engine mounts on the subframe, with the transmission mount supporting the rear of the powertrain unit.

The engine mount’s whole job is to keep the straight-six sitting exactly where it should be, while soaking up the shakes and shudders the driver doesn’t want to feel through the cabin. On the 2004 Lexus IS200/IS300, the mounts secure the engine to the front crossmember, control torque movement under throttle and braking, and help maintain driveline angles so the gearbox and tailshaft behave nicely. Many are hydraulic (fluid-filled) to tame vibration at idle and cruise, giving that smooth, quiet Lexus feel owners expect.

As these mounts age, the rubber hardens or splits, and hydraulic units can seep. That’s when owners start chasing annoying vibes at idle, a thump on take-off, or a clunk when shifting from Reverse to Drive. Under the bonnet, the engine can sit a little lower or rock more than it should.

• Tell-tale signs: harsh vibration at idle (especially in Drive), thuds on acceleration, excessive engine movement, visible cracks/collapse in the rubber, or oily residue from a leaking mount.
• Service tip: at regular services, a quick visual check and a gentle pry-bar test under professional care goes a long way. Look for perished rubber, contact points, and check the earth strap and exhaust flex for stress.

When it’s time to replace, it’s smart to do both left and right engine mounts together, and assess the transmission mount while at it. A proper job involves safely supporting the engine, removing the through-bolts, lifting slightly, swapping the mount, then torquing the hardware to Lexus specs with the powertrain settled. Because geometry matters, fitting quality OEM or equivalent mounts is worth it—IS300 mounts, for example, are tuned for the 2JZ’s mass and heat, and differ from IS200 items.

After replacement, expect the cabin to feel calmer and shifts cleaner. It’s good practice for a technician to re-check fasteners after a few hundred kilometres and ensure the exhaust and hoses are sitting stress-free. Many mounts last 120,000–200,000 km depending on climate and driving style, but age alone can finish them off, periodic inspection is cheap insurance.

How many engine mounts does a 2004 Lexus IS have?

It has two primary engine mounts (left and right) on the front subframe, plus a separate transmission mount supporting the rear of the powertrain. Some people casually count three “engine” mounts, but technically the third is the transmission mount.

Are IS200 and IS300 engine mounts the same?

They’re similar in layout but not always interchangeable. The IS300’s 2JZ-GE is heavier and can use different part numbers and stiffness rates. The EPC and Lexus repair data specify mounts by VIN/engine, matching the correct mount type to the exact model is the go.

How long do mounts last and what does replacement cost?

Typically 120,000–200,000 km, or sooner with heat, age, or rough roads. In Australia and New Zealand, expect parts-and-labour to vary widely with brand and workshop—often several hundred to around a thousand dollars if doing both sides, more if the transmission mount is added. A proper inspection will pin down cost accurately.