Parts for your 2009 Subaru Outback-Exhaust gasket

2009 Subaru Outback Exhaust Gasket — What it is, why it matters, and when to swap it

Per the Subaru Factory Service Manual for the BP/BL Outback (2005–2009), the Subaru FAST electronic parts catalogue, and procedures published on Subaru’s Technical Information System, the 2009 Subaru Outback absolutely uses exhaust gaskets. They’re fitted at the cylinder head to exhaust manifold, at the manifold/front pipe “donut” joint with spring bolts, and at various flanged joints through the centre pipe and rear mufflers. So yes — an exhaust-gasket is relevant and used on this model.

This Outback’s exhaust gaskets do the quiet, essential work of sealing hot gases as they leave the engine. A proper seal keeps the cabin free of fumes, prevents that tinny tick at cold start, maintains correct oxygen sensor readings for fuel control, and protects power and fuel economy. Whether it’s the 2.5-litre EJ or the 3.0R H6, both setups rely on crush-type and multi-layer steel gaskets to keep everything leak-free.

As part of routine servicing, it’s smart to inspect gasket joints for soot marks, a sharp tapping noise on start-up, a sulphur smell, or a hiss under load. Cars that see gravel, corrugations, or the odd off-road knock are more prone to flange and donut gasket leaks.

Replacement is straightforward workshop fare but benefits from the right approach:

• Don’t reuse old gaskets — the crush rings and MLS layers are designed for one clamp-down only.
• Follow FSM torque specs and sequence, tighten evenly to avoid warping flanges.
• Use new spring bolts where specified, they maintain clamping force as parts heat-cycle.
• A dab of anti-seize on studs is fine, but avoid sealants unless Subaru explicitly calls for them.

If a gasket near the manifold is leaking, it’s best not to keep driving — exhaust gases can enter the cabin and may skew sensor readings, leading to rough running. Parts are typically inexpensive, and labour ranges from a quick half-hour for a rear muffler flange to a few hours if manifold gaskets or seized hardware are involved. Keeping these seals healthy helps the Outback stay quiet, efficient, and ready for the next long Kiwi or Aussie road trip.

Popular questions about 2009 Subaru Outback exhaust gaskets

Where are the exhaust gaskets on a 2009 Subaru Outback?
They sit at the cylinder head to manifold, the manifold to front pipe donut joint with spring bolts, and at flanged joints through the centre and rear sections. Both the 2.5i and 3.0R setups use multiple gaskets along the system.

Can exhaust gaskets be reused?
Best practice is no. The crush-type and multi-layer steel gaskets deform to seal once. Reusing them risks leaks, noise, and incorrect O2 sensor readings. Fit new gaskets any time a joint is disturbed.

How much does replacement usually cost?
Gaskets themselves are typically modest — often tens of dollars per joint. Labour varies with location and corrosion: a rear flange gasket might be under an hour, while manifold gaskets or seized studs can push the job to a few hours.