Parts for your 2014 Subaru Outback-Exhaust gasket

2014 Subaru Outback exhaust gaskets: what they do and when to replace them

Exhaust gaskets are absolutely used on the 2014 Subaru Outback. Technical references including the Subaru Service Manual for 2010–2014 Legacy/Outback (BR/BM) – Exhaust section – and the Subaru Electronic Parts Catalogue (FAST) specify multiple exhaust sealing gaskets on this model. Both the 2.5‑litre FB25 and 3.6‑litre EZ36 variants use multi‑layer steel manifold‑to‑head gaskets, crush “donut” ring gaskets at the manifold/front pipe and other flanged joints, plus sealing washers for O2 sensors. So yes, they’re relevant parts on this vehicle.

The job of an exhaust gasket is dead simple but critical: it seals hot exhaust gas at joints so nothing leaks out and fresh air can’t sneak in. That keeps the Outback quiet, prevents fumes under the cabin, protects power and fuel economy, and makes sure the oxygen sensors read properly so the ECU can keep mixtures on point. A tired gasket can cause an annoying ticking on cold start, a whiff of exhaust, soot marks around a flange, a rasp under load, or even a check engine light for fuel trims or catalyst efficiency.

There’s no fixed replacement interval in the factory schedule, but gaskets are considered single‑use whenever a joint is disturbed. Any time the manifold, front pipe, cat section or mufflers come off, new gaskets should go in. On high‑kilometre cars or those doing lots of short trips, heat cycling and corrosion can flatten or crack them sooner.

• Typical locations on a 2014 Outback (BR): manifold‑to‑head (MLS gaskets), manifold‑to‑front pipe donut gasket with spring bolts, mid‑pipe/muffler flange gaskets, and O2 sensor crush washers.
• Tell‑tales of a leak: ticking on start‑up that quietens warm, exhaust odour around the engine bay or underbody, black soot at a joint, droning or rasp, increased fuel use, or WOF/roadworthy knock‑backs.
• Good practice when servicing: let the exhaust cool fully, soak fasteners with penetrant, support the system so it’s not hanging on studs, clean mating faces, install new gaskets and spring bolts where fitted, tighten evenly in a criss‑cross pattern, and follow the Subaru torque specs in the service manual. A post‑heat‑cycle recheck is wise if specified.

Owners in Australia and New Zealand will often replace the front pipe donut and spring bolt set when chasing leaks or after off‑road knocks. Reusing crushed or heat‑baked gaskets can lead to repeat leaks, so keeping fresh ones on hand for any exhaust job saves time and grief. If in doubt, a quick inspection on a hoist during regular servicing can spot early blow‑by before it becomes noisy or triggers a CEL.

FAQs

Does a 2014 Subaru Outback have exhaust gaskets?
Yes. Factory documentation (Subaru Service Manual – Exhaust section, and the Subaru FAST parts catalogue) lists manifold‑to‑head gaskets, donut ring gaskets at the front pipe, and additional flange gaskets and O2 sensor seals. Both FB25 and EZ36 engines use them.

Where are the exhaust gaskets located on this model?
They sit at every key join: between the cylinder head and exhaust manifold, the manifold and front pipe (with a spring‑loaded donut), mid‑pipe to cat/muffler flanges, and at O2 sensors with crush seals. If any of these joints are opened up, new gaskets should be fitted.

Can a leaking exhaust gasket cause a check engine light?
It can. A leak upstream of the O2 sensors may let air in, skewing sensor readings and fuelling, which can trigger mixture or catalyst efficiency codes. Fixing the leak and clearing the codes usually restores normal operation.