Parts for your 2019 Subaru Impreza-Manifold gasket

2019 Subaru Impreza manifold gasket — what it does, why it matters, and when to replace it

Based on Subaru’s own technical documentation — including the 2019MY Impreza FB20 engine service manual (Intake and Exhaust sections), the Subaru Technical Information System (STIS), and the Subaru FAST genuine parts catalogue — the 2019 Subaru Impreza is fitted with manifold gaskets. It uses intake manifold gaskets between the intake manifold and each cylinder head, and exhaust manifold gaskets where the exhaust header meets the heads. So yes, a manifold gasket is absolutely relevant on this model.

On the 2019 Impreza, the manifold gasket’s job is to keep the engine airtight where it matters most. Intake manifold gaskets seal the air and fuel path so the engine management can meter airflow precisely. Exhaust manifold gaskets keep hot gases from sneaking out before they hit the catalytic converters. When these seals are healthy, the engine runs smoothly, fuel trims stay tidy, and emissions remain compliant.

There’s no fixed service interval for manifold gaskets, but they should be inspected whenever related work is done. Intake gaskets on the FB20 are typically a moulded rubber/metal design and should be replaced if the manifold is removed or if there’s any sign of hardening, flattening, or damage. Exhaust gaskets are crush-type or multi-layer steel, they’re considered single-use items and should be replaced any time the exhaust manifold is taken off. Using genuine-spec gaskets helps avoid repeat leaks.

Common clues a manifold gasket is on the way out include:

• Rough idle, high or unstable idle, or a lean condition (often with a check engine light) from an intake leak
• Ticking sound on cold start, exhaust smell under the bonnet, or sooty marks near the flange from an exhaust leak
• Higher fuel use and lacklustre throttle response

When replacing, keep it clean and by-the-book. Mating surfaces should be spotless and flat, avoid scraping gouges into alloy heads. Don’t use sealant on moulded intake gaskets unless the Subaru procedure explicitly calls for it. Fit new fasteners where Subaru specifies, and always follow the factory torque specs and tightening sequence for the FB20. After refit, clear codes, reset fuel trims if needed, and road test to confirm trims and idle are stable. It’s a straightforward job for a competent tech, and doing it right saves headaches — and keeps the Impreza humming along for many more kilometres.

Popular questions about 2019 Subaru Impreza manifold gaskets

Where are the manifold gaskets on a 2019 Impreza?

There are intake manifold gaskets between the intake manifold and each cylinder head, and exhaust manifold gaskets where the exhaust header bolts to the heads. The intake seals keep unmetered air out, the exhaust seals keep hot gases in until they reach the catalytic converters.

What are the signs of a failing manifold gasket on this model?

For intake leaks: rough or high idle, lean fuel trims, and a check engine light. For exhaust leaks: a ticking noise on cold start, exhaust odour in the engine bay, and black soot near the manifold flange. Any of these warrant inspection.

Do the gaskets need replacing every time the manifold is removed?

Exhaust manifold gaskets should always be replaced once disturbed. Intake manifold gaskets are often reusable in theory, but on the FB20 it’s best practice to fit new intake gaskets when the manifold comes off to prevent future vacuum leaks.