Parts for your 2007 Subaru Impreza-Oil pump

2007 Subaru Impreza Oil Pump — Purpose and Servicing

Yes, the 2007 Subaru Impreza is fitted with an engine oil pump. This is documented in the 2007 Subaru Impreza Factory Service Manual (Lubrication System section), the Subaru genuine parts catalogue (Group 15: Lubrication — Oil Pump Assembly), and mainstream workshop references such as the Haynes Repair Manual for Subaru Impreza 2002–2011. All EJ20/EJ25 variants, including WRX and STI, use a crankshaft-driven trochoid (gerotor) oil pump mounted in the front cover.

The oil pump on a 2007 Subaru Impreza does the heavy lifting to keep the EJ engine alive. Driven directly off the crank, it draws oil from the sump and sends it under pressure through galleries to the crank and rod bearings, cam journals, and—on turbo models—the turbocharger. It also feeds AVCS where fitted. Beyond simple lubrication, that oil flow carries heat away and flushes contaminants to the filter, so stable pressure is key to engine longevity.

It’s not a routine “wear item” like a timing belt, but it deserves attention when the front of the engine is open. A smart time to inspect it is during timing belt service (around the manufacturer’s kilometre interval for the local market). A workshop will check the rotor face for scoring, rotor end‑play and backlash against spec, the relief valve’s free movement, and that the pump backing plate screws are secure. They’ll also look at the pump O‑ring and front crank seal for sweat or drips. If the internals are healthy, a clean, correct re-seal with the specified sealant and O‑ring, threadlocker where Subaru calls for it, and proper torque goes a long way. Priming the pump with clean oil before start‑up helps it build pressure straight away.

When is replacement on the cards? Signs include a hot‑idle oil light flicker, verified low pressure on a mechanical gauge, rumbling bearing noise, AVCS‑related faults, or turbo distress on WRX/STI. Always confirm with a proper pressure test rather than guessing. Good habits help the pump and the whole engine: use the oil grade listed in the owner’s manual, keep service intervals tight (especially for turbo use), and don’t go wild with sealant—excess can end up near the pickup. The job involves removing the crank pulley and timing belt, so it’s doable for a confident DIYer with the right tools, but most owners will prefer a Subaru‑savvy workshop under the bonnet.

• Use quality oil and filters as specified.
• Inspect/replace the front crank seal if weeping.
• After refit, verify oil pressure with a gauge or scan data.

Popular questions about 2007 Subaru Impreza oil pumps

Does a 2007 Subaru Impreza actually have an oil pump, and where is it?
It does. Every EJ20/EJ25 in 2007 Imprezas uses a crank-driven trochoid pump. It’s housed in the front cover behind the crank pulley, so access is via the timing belt area. Factory documentation and parts catalogues list it as the oil pump assembly in the lubrication group.

Should the oil pump be replaced or just resealed during a timing belt service?
Most of the time a reseal and inspection is enough. If the rotors and housing aren’t scored, the relief valve moves freely, and oil pressure meets spec, it’s usually fine to keep. Replace the O‑ring and seals, apply the correct sealant, and torque fasteners to factory spec. Replace the whole pump if pressure is low or there’s internal damage.

What are the symptoms of a failing oil pump on an EJ engine?
Watch for an oil warning light that flickers at hot idle, confirmed low readings on a mechanical gauge, rattly bearing noises, AVCS performance faults, or turbo noise on WRX/STI models. Before blaming the pump, rule out thin/old oil, a blocked pickup, or a dodgy pressure switch.