Parts for your 2018 Honda Cr-v-Manifold gasket

2018 Honda CR‑V manifold gasket: what it does and when to replace it

Based on the Honda CR‑V 2017–2019 (RW/RT) Service Manual and Honda’s Electronic Parts Catalogue for the RW series with the L15B7 1.5‑litre turbo engine, this model uses an intake manifold gasket between the intake manifold and the cylinder head. There isn’t a separate exhaust manifold gasket on the L15B7 because the exhaust manifold is cast into the cylinder head, the turbocharger mounts directly to the head with its own metal gasket. That makes “manifold gasket” a relevant part for the intake side on a 2018 Honda CR‑V in Australia and New Zealand.

The intake manifold gasket seals the join so there’s no unmetered air sneaking past under vacuum or boost. On a turbo CR‑V, a proper seal keeps fuel trims stable, helps it idle smoothly, protects fuel economy, and maintains crisp throttle response. It also ensures the engine management can control emissions properly.

It’s not a regular replacement item, but it’s a single‑use seal that should be renewed any time the manifold is removed for work like injector service, carbon clean, or intake runner inspection. Age, heat, and repeated heat cycles can harden or deform the gasket, and even a tiny leak can play havoc with drivability.

Tell‑tales of a tired intake manifold gasket include:

• Rough or high idle, stumbling off‑boost, or a faint hiss near the manifold
• Lean mixture codes (e.g., P0171), long‑term fuel trims trending positive
• Higher than usual fuel use or a whiff of fuel under the bonnet

During servicing, a technician will often do a quick visual around the manifold flange for dust tracks or oil mist that suggest seepage, and may run a smoke or boost‑leak test if symptoms call for it. If the manifold is coming off, best practice is:

• Always fit a new genuine‑spec gasket, don’t reuse the old one
• Clean and inspect mating faces, avoid sealants unless Honda specifies
• Follow the factory torque values and tightening sequence
• Perform idle learn/throttle body relearn if the battery is disconnected

For owners, keeping the air filter fresh and fixing any PCV or vacuum hose issues early reduces stress on the gasket. If your 2018 CR‑V is one of the non‑turbo variants in other markets, there may also be a conventional exhaust manifold gasket, however, for AU/NZ 1.5T models the intake manifold gasket is the key “manifold gasket” to consider.

Popular questions

Does the 2018 Honda CR‑V have an exhaust manifold gasket?
On AU/NZ 1.5‑litre turbo models (L15B7), no separate exhaust manifold gasket is used because the exhaust manifold is integrated into the cylinder head. The turbocharger mates to the head with a dedicated metal gasket. Some non‑turbo variants in other markets may use a conventional exhaust manifold and gasket.

What are the symptoms of a leaking intake manifold gasket?
Common signs include a rough or surging idle, lean codes such as P0171, a hissing noise near the intake, higher fuel consumption, or sluggish off‑boost response. A smoke test or fuel‑trim analysis usually confirms a leak.

Should the gasket be replaced whenever the intake manifold is removed?
Yes. The intake manifold gasket is designed as a single‑use seal. Any time the manifold is off—for injector work, carbon cleaning, or diagnostics—fit a new genuine‑spec gasket and follow the factory torque sequence to avoid future leaks.