Parts for your 2009 Subaru Forester-Exhaust gasket

2009 Subaru Forester exhaust gasket

Based on the Subaru Forester SH (2009) Service Manual (Exhaust and Engine sections) and the Subaru FAST parts catalogue, the 2009 Forester does use exhaust gaskets at several joints. These include the exhaust manifold-to-cylinder head gaskets, a crush “donut” gasket at the front pipe, and flange gaskets further downstream, turbocharged XT models also add turbo outlet and up-pipe/downpipe gaskets. So yes—exhaust gaskets are fitted and matter on this model.

An exhaust gasket’s job is simple but critical: it seals the join between exhaust components so hot gases don’t leak out, noise stays under control, and the oxygen sensors get clean, accurate readings. In the Forester’s case, multi-layer steel (MLS) manifold gaskets handle the heat right at the head, while the spring-loaded “donut” gasket lets the system flex a bit without leaking as the engine moves. If a gasket fails, you’ll often hear a ticking on cold start, smell fumes around the engine bay or under the car, and maybe see a drop in fuel economy from skewed O2 sensor feedback.

For servicing, exhaust gaskets aren’t a time-based replacement like oil or filters, they’re replaced when disturbed or if there’s evidence of leakage. Any time the exhaust is split—say for clutch work, transmission removal, or muffler upgrade—new gaskets should go in. Using quality OEM-spec parts is worth it on the Forester, especially the manifold MLS gaskets and the correct-size front-pipe donut, because fit and crush characteristics are spot on.

Good workshop practice on a 2009 Forester includes inspecting for sooty marks around joints, listening for a light chuffing noise, and checking spring bolts and hangers. If replacing, support the exhaust so nothing hangs off a single flange, clean the mating faces, and fit new hardware where Subaru specifies springs and self-locking nuts. Follow the Subaru torque specs from the SH service manual, overtightening can warp flanges or crush a donut unevenly. A dab of high-temp anti-seize on exposed fastener threads can help the next time, but keep it off oxygen sensor threads unless using the correct sensor-safe compound.

For roadworthiness (WOF/reg), any visible exhaust leak is a fail, so fixing a gasket seep early avoids bigger hassles—and keeps the Forester quiet, safe, and running sweet as.

• How do you spot a blown exhaust gasket?
• Are turbo and non-turbo gasket sets the same on a 2009 Forester?
• Is it safe to drive with a leaking exhaust gasket?

How do you spot a blown exhaust gasket?
Common clues are a ticking or chuffing noise on cold start that softens as it warms, a whiff of exhaust under the bonnet or near a joint, and black sooty tracks at the flange. Some drivers also notice a slight loss of power or worse fuel use if leaks upset O2 sensor readings.

Are turbo and non-turbo gasket sets the same on a 2009 Forester?
No. XT (turbo) models add turbo outlet and up-pipe/downpipe gaskets and often use different flange shapes. The manifold-to-head MLS gaskets are similar across EJ variants, but the turbo hardware and extra joints mean you’ll need the correct set for your VIN.

Is it safe to drive with a leaking exhaust gasket?
Short trips might be possible, but it’s not ideal. Leaks can let fumes into the cabin, can be noisy, and may trigger sensor faults over time. It’s best to get it sorted promptly—especially for WOF/reg compliance and to protect nearby components from heat.