Parts for your 2018 Nissan Pathfinder-Exhaust gasket

2018 Nissan Pathfinder exhaust gasket — what it does and when to replace it

Referencing Nissan’s factory technical information for the R52 series (2017–2019) — specifically the Factory Service Manual (EX: Exhaust System and EM: Engine Mechanical) — and the Nissan Electronic Parts Catalogue (FAST/EPC) for the 2018 3.5‑litre V6, the 2018 Nissan Pathfinder is fitted with multiple exhaust gaskets. These include cylinder head to exhaust manifold gaskets (one per bank), crush “donut” gaskets between the manifold outlets and front pipes, and flange gaskets further down the system. Major aftermarket catalogues also list manifold and pipe gaskets for this model. So yes, exhaust gaskets are relevant and used on the 2018 Pathfinder.

On the 2018 Nissan Pathfinder, the exhaust gaskets do the quiet, crucial work of sealing hot gases as they leave the engine and make their way through the catalytic converters and mufflers. They keep things leak‑free, stop that tell‑tale ticking on cold start, and help the O₂ sensors read properly so the V6 runs smoothly and within emissions targets.

These gaskets live between harsh heat cycles and road grime, so while they’re designed to last, they’re also classed as replace‑on‑disturb parts. Any time the exhaust manifolds, front pipes, or flange joints are separated — whether for engine work, catalytic converter replacement, or rusted hardware — fresh gaskets should go in. The Pathfinder’s manifold gaskets are typically multi‑layer steel, and the front pipe uses crush “donut” rings, both are one‑time use.

For owners, there’s no set service interval, but there are a few easy tells that a gasket’s had enough:

• Sharp ticking or puffing noise on start‑up that softens as it warms
• Whiffy exhaust odour near the engine bay or under the floor
• Sooty marks around a flange or manifold area
• Slight loss of power or a change in fuel economy

When replacing, a mechanic will let the system cool fully, support the exhaust so it’s not hanging on studs, and follow the factory torque specs and tightening sequence (especially at the manifolds). New self‑locking nuts and studs are a smart move if the old ones are corroded. It’s also a good time to inspect heat shields, hangers, and the condition of the front pipe flex section.

Quality counts here. OEM‑equivalent multi‑layer steel manifold gaskets and the correct crush rings seal better and stay sealed. Done right, the Pathfinder’s exhaust will go back to being quiet, clean, and drama‑free for many kilometres.

Popular questions about 2018 Nissan Pathfinder exhaust gaskets

What are the common symptoms of a failing exhaust gasket on a 2018 Pathfinder?
Owners usually notice a ticking or chuffing noise on cold start that eases as the engine warms, a faint exhaust odour around the engine bay or under the car, or black soot at a joint. In some cases, the check engine light can appear if the leak upsets O₂ sensor readings.

Left alone, leaks can worsen, harden nearby rubber components, and allow fumes to enter the cabin at idle or low speeds, so it’s best to sort them quickly.

Is it safe to drive with a leaking exhaust gasket?
Short local trips might be possible, but it’s not recommended. Exhaust leaks can allow carbon monoxide into the cabin and may damage nearby wiring or components from excess heat. Performance and fuel economy can also take a hit. Get it checked and repaired promptly.

How much does exhaust gasket replacement cost in Australia or New Zealand?
For flange or front pipe gaskets, expect parts from roughly $25–$120 per joint and 1–3 hours’ labour depending on corrosion. Manifold gasket jobs are more involved — commonly 4–8 hours — so totals can land anywhere from about $300 to $1,400+ depending on access, broken studs, and local rates.

Actual pricing varies by workshop and condition of the hardware, so a written quote after inspection is the go.