Parts for your 2022 Subaru Impreza-Manifold gasket

2022 Subaru Impreza manifold gasket: what it does and how to look after it

Based on technical sources, a manifold gasket is absolutely used on the 2022 Subaru Impreza. The Subaru factory service manual (STIS) for MY2022 details intake manifold and exhaust manifold removal procedures that call for replacing the related gaskets on reassembly, and the official Subaru parts catalogue for the FB-series 2.0-litre engine lists both intake manifold gaskets and exhaust manifold/header gaskets. That makes the manifold gasket a relevant, fitted component on this model.

On a 2022 Subaru Impreza, the manifold gaskets do the quiet, crucial work of sealing where the intake and exhaust manifolds bolt to the cylinder heads. The intake manifold gasket keeps unmetered air out so the engine control unit can hold the right air–fuel mix, while the exhaust side gasket prevents hot gases from escaping before they reach the catalytic converter. When these seals are spot on, the Impreza idles smoothly, pulls cleanly through the revs, and keeps emissions in check.

These gaskets are consumables in practice. They’re not on a fixed replacement interval, but they should be renewed any time the manifold is removed—such as for spark plug access on some jobs, carbon cleaning, or exhaust work. Reusing a crushed metal or composite gasket is a false economy, once compressed and heat-cycled, it won’t seal as designed the second time.

Typical signs it’s time to act include a hissing or whistling under the bonnet and rough idle (intake leak), or a ticking noise on cold start, soot traces at the flange, and a sharp exhaust smell (exhaust leak). Left unattended, intake leaks can drive up fuel trims and hurt economy, while exhaust leaks can skew oxygen sensor readings and risk damaging the cat.

• Always use quality OE-spec gaskets, cheap copies can warp or crush unevenly.
• Clean mating faces carefully—no gouges, no leftover sealant—and avoid RTV unless the manual specifically calls for it.
• Torque the manifold fasteners in the factory sequence, in stages, with the engine cold. Don’t over-tighten, flat-four heads don’t love it.
• During routine servicing (say every 50,000–100,000 km), a quick listen for vacuum or exhaust leaks and a look for soot marks is smart preventative care.

Done right, fresh manifold gaskets keep the FB engine happy, efficient, and quiet—exactly how a daily-driver Impreza should be.

Popular questions about 2022 Subaru Impreza manifold gaskets

How often should the manifold gaskets be replaced on a 2022 Impreza?
They’re not a scheduled item. Replace them whenever the intake or exhaust manifold is removed. Between times, just monitor for symptoms—noises, odours, fuel trims—and address promptly if they crop up.

What are the symptoms of a failing intake manifold gasket?
Expect a rough or high idle, a check engine light with lean codes, increased long-term fuel trims, and a faint hiss near the intake. Spray testing around the joint (done safely) can help pinpoint a change in idle when there’s a leak.

Is it safe to drive with a leaking exhaust manifold gasket?
Short trips to the workshop are usually fine, but it’s best not to leave it. Hot gas leaks can affect nearby components, and false oxygen sensor readings can lead to poor running and potential catalyst issues.