Parts for your 2005 Toyota Highlander-Oil pump

2005 Toyota Highlander oil pump — what it does and how to look after it

Yes, the 2005 Toyota Highlander uses an oil pump. Toyota’s Factory Service Manual for the 2AZ‑FE 2.4‑litre and 3MZ‑FE 3.3‑litre V6, along with Toyota’s Electronic Parts Catalogue, identify a crankshaft‑driven trochoid (gerotor) oil pump mounted in the front timing cover. These sources show the pump supplies pressurised oil to bearings, VVT‑i components and the valvetrain, so it’s very much a core part of the engine.

On this Highlander, the oil pump’s job is to move the right amount of oil at the right pressure through the engine as revs and temperature change. That steady oil pressure keeps the big‑end and main bearings happy, feeds the camshafts and lifters, and lets the VVT‑i system adjust cam timing smoothly. Without a healthy pump and clean oil, cold starts can rattle, hot idle pressure can sag, and wear can snowball.

Routine servicing is the best protection. Stick with the correct oil grade and quality filter, keep change intervals sensible for local conditions, and watch for leaks at the timing cover area. Because the pickup screen sits in the sump, consistent oil changes help prevent sludge from starving the pump. If the low oil pressure lamp flickers, there’s a rattle on start‑up, or there are VVT‑i performance codes alongside clean oil and the right level, the pump and its relief valve are worth a closer look.

Replacement isn’t a regular “every X kilometres” item, but it’s on the cards if there’s bearing damage, severe sludge history, or the front cover is off for major work. Access is from the front of the engine under the bonnet, expect to remove the right‑hand engine mount, accessory drive, crank pulley, and timing cover. Best practice is to install a quality pump (or overhaul with genuine seals), renew the pump O‑ring, front crank seal and timing cover sealant, check clearances, and prime the pump with clean oil before first crank. After reassembly, verify oil pressure and listen for any abnormal noise. A workshop with Toyota experience will have the torque specs and sealant patterns from the FSM, which helps avoid leaks and comebacks.

• Common warning signs: oil light at idle, start‑up rattle, timing noise, metallic debris in oil, or fresh leaks at the front cover.
• Good habits: correct oil, on‑time changes, genuine or high‑quality filter, and fixing leaks early.

Popular questions

Where is the oil pump on a 2005 Toyota Highlander?
The pump sits in the front timing cover and is driven directly by the crankshaft. It’s submerged in oil, drawing through a pickup in the sump and sending pressurised oil through the galleries and filter. Access requires front‑of‑engine disassembly rather than dropping the sump alone.

Can the oil pump be replaced with the engine in the vehicle?
Yes, in most cases. The job involves supporting the engine, removing the right engine mount, belts, crank pulley, and the timing cover. It’s a fair bit of labour, but the engine typically stays in the bay. Correct sealant use, O‑ring replacement and pump priming are critical.

Should the oil pump be replaced as preventative maintenance?
Not usually. Toyota doesn’t list a time‑based replacement. Focus on clean oil, the correct grade, a good filter, and fixing any leaks. Consider replacement only if there’s verified low pressure, internal wear, sludge history, or when the timing cover is already off for other repairs.