Parts for your 2003 Toyota Highlander-Engine mount

2003 Toyota Highlander (Kluger) engine-mount — purpose, care, and when to replace

Engine mounts are absolutely fitted to the 2003 Toyota Highlander (known as Kluger in Australia and New Zealand). Technical sources such as the Toyota Highlander/Kluger 2001–2007 Repair Manual (Drivetrain/Chassis > Engine Mounting) and the Toyota Electronic Parts Catalog (EPC) for ACU20/ACU25/MCU20/MCU25 list multiple “engine mounting insulator” assemblies for this model. Depending on engine and driveline, it typically uses three to four mounts: a right‑hand engine mount, a left transaxle mount, and front/rear torque (roll-stop) mounts.

On this Highlander, the engine mounts do two big jobs: they hold the engine and transaxle securely in place, and they isolate vibration so the cabin stays quiet and comfy. Under acceleration, braking, and over rough roads, the mounts control how much the powertrain can rock, keeping driveshafts, exhaust, and hoses aligned and happy. Hydraulic (fluid-filled) mounts used on many variants add extra damping at idle to keep the steering wheel and seats free of annoying buzz.

There isn’t a set replacement interval, but by 150,000–200,000 km many original mounts are past their best—especially if the vehicle tows, sees lots of stop–start city work, or lives with oil leaks. Regular servicing of a 2003 Highlander should include a quick visual and NVH check of the mounts.

• Common symptoms: noticeable vibration at idle in Drive, clunks when shifting from Reverse to Drive, a thump on take‑off, or visible engine movement when blipping the throttle.
• What to inspect: split or collapsed rubber, fluid seepage from hydraulic mounts, torn brackets, or shiny witness marks where the engine has been contacting stops.

When replacement is due, using genuine Toyota mounts or high‑quality equivalents keeps NVH close to factory. A workshop will support the engine with a jack and timber block, replace one mount at a time, and torque the fasteners with the engine at normal ride height. It’s smart to recheck torque after a short shakedown drive. For V6 models, access around the subframe and rear roll‑stop can be tighter, so allow extra time.

DIYers should use axle stands, support the sump carefully, and avoid prying against alloy components. Swapping only one failed mount can transfer extra load to the rest, so assess the full set—especially the opposing torque mount. Addressing oil leaks early will also extend mount life.

Popular questions about 2003 Toyota Highlander engine mounts

How many engine mounts does a 2003 Highlander have?
Most 2003 Highlanders run three to four mounts, depending on engine and driveline. Expect a right‑hand engine mount, a left transaxle mount, and front/rear torque (roll‑stop) mounts. AWD and V6 variants commonly use the full four‑mount layout.

What are the signs an engine mount is failing on this model?
Tell‑tales include excess vibration at idle (worse in Drive with the A/C on), clunks when shifting between Reverse and Drive, a lurch on take‑off or lift‑off, and visible engine movement. Fluid on or around a mount can point to a leaking hydraulic mount.

Is it safe to keep driving with a broken engine mount?
Short trips to a workshop are usually okay if driven gently, but it’s not ideal. A failed mount can stress exhaust flex joints, CV shafts, and hoses, and the extra vibration can quickly wear other components. Get it sorted promptly.