Parts for your 2009 Holden Commodore-Exhaust gasket

2009 Holden Commodore exhaust-gasket: what it does and when to replace it

Yes, the 2009 Holden Commodore uses exhaust gaskets. Factory service information for the VE series (Holden/GM SI) specifies installing a new exhaust manifold gasket whenever the manifold is removed, and the GM Global EPC parts catalogue lists exhaust manifold and exhaust pipe flange gaskets for both the 3.6L Alloytec V6 and 6.0L V8 variants. Australian aftermarket catalogues (Permaseal, Walker, and similar) likewise list specific manifold and flange/donut gaskets for 2006–2013 VE models. That makes exhaust-gasket replacement a normal, relevant task on this platform.

On a 2009 Commodore, the exhaust-gasket’s job is straightforward: seal the hot, high‑pressure gases as they leave the cylinder head and travel through the manifold and pipes. A healthy seal keeps the note crisp, prevents fumes under the bonnet, protects nearby components from heat and soot, and stops extra oxygen sneaking into the system and confusing the oxygen sensors. On the VE, you’ll typically find a multi‑layer steel or graphite manifold gasket at the head, and crush‑ring or flat gaskets at certain flanged joints further down the system. Some ball‑and‑socket joints use a steel ring “donut” to maintain the seal through heat cycles.

It’s not a scheduled replacement item, but it’s smart to replace exhaust gaskets any time the manifold or pipes come off, or if symptoms point to a leak. Common signs include a ticking noise on cold start that softens as it warms, soot traces around the manifold or flanges, a whiff of exhaust in the cabin at idle, harsher exhaust note, or even a check‑engine light if a leak upsets fuel trims.

• Use quality gaskets matched to your engine (V6 LY7/SIDI or V8 L98/L76/LS3) and the joint type.
• Inspect the manifold and mating faces for warping or cracks, replace studs and nuts if corroded.
• Follow the factory torque specs and sequence (work from the centre out in stages on the manifold).
• After first heat cycle, recheck for leaks and fastener integrity, don’t overtighten spring‑bolted flanges.
• Mind O2 sensor wiring near the manifolds and cats, heat shields must go back on correctly.

Left leaking, an exhaust gasket can cook nearby components, make the Commodore smell and sound rough, and nudge fuel economy the wrong way. Fixed properly with the right gasket set and torque procedure, the VE’s system seals up nicely and stays that way through plenty of Aussie and Kiwi kilometres.

• How do they spot a blown exhaust-gasket on a 2009 Commodore?

  Listen for a sharp ticking on cold start that fades as it warms, look for sooty marks around the manifold or flange joints, and watch for a faint exhaust odour under the bonnet. A scan tool showing lean trims near idle can also point to an upstream leak.

• Are V6 and V8 Commodore exhaust gaskets the same?

  No. The VE’s V6 and V8 use different manifold designs and gasket shapes, and some mid‑pipe joints differ as well. Always order by VIN or engine code to get the correct manifold and flange/donut gaskets.

• Is it safe to drive with a leaking exhaust-gasket?

  Short trips might be possible, but it’s not ideal. Hot gas can damage wiring and plastic nearby, fumes can enter the cabin, and the engine may run off due to false O2 readings. It’s best to sort it promptly.