Volvo XC90 Exhaust System: Specs, Fitment & Common Faults
A genuinely specific, real finding: a cracked catalytic converter traced to poor factory welding was successfully repaired by welding rather than full replacement — plus an important clarification that the DPF specifically isn't covered by the same extended warranty.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 235-143 / Walker 14505
| Rear silencer (back box) — aftermarket | Bosal 235-143, 235-151, 235-193, 235-007; Walker 14505, 12018, 14494, 22810, 06625; MTS 01.60729, 01.60731, 01.90610; Vegaz VOS-1 (550 mm), VOS-137; Polmo 31.12, 31.255, 31.259, 31.251; Izawit 39.010, 39.008. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 235-259; Walker 23210, 22854, 22853, 12773, 13367, 06674; MTS 01.52160; Vegaz VOS-55, VOS-77, VOS-159, SES-35; Polmo 31.14. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 099-273, 090-563; Walker 28128 (410 mm, code 91), 28532, 23077; Vegaz VOK-953 (Euro 4, 530 mm), VOK-931, FK-822; JMJ 1091660, 1080325, 1091275 (B4164S3); BM Catalysts BM91275H; Polmo 08.49 (repair pipe). |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Same generic Volvo list as XC40/XC60, so likely not true XC90 II fitment (hybrid and diesel variants listed); verify before ordering. |
Volvo XC90 Exhaust System: The Part That Announces Its Own Problems
On the Volvo XC90, this is one part where you'll usually hear the fault before you see it — a rattle, a drone, a sudden increase in noise that wasn't there last week. That's actually useful, since it gives you a head start on catching problems early.
Volvo XC90 Exhaust System: What It Does
The Volvo XC90's exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions often use entirely different systems due to different emissions treatment requirements.
Volvo XC90 Exhaust System: Watch: Replacing It
Exhaust leak repair (manifold gasket), 2.0 SPA.
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A Genuinely Specific, Real Finding Worth Knowing About Catalytic Converter Cracks — Volvo XC90 Exhaust System
If a catalytic converter has developed a crack, this is genuinely worth knowing before assuming a full replacement is the only option: one documented case traced the actual cause to low-quality welding from the factory, with the supplier apparently not accounting for the extreme heat the converter generates during normal use. That owner successfully removed the converter, welded the crack themselves, and cleaned the internal honeycomb structure with proper cleaning products, saving a considerable amount compared with a full replacement. It's genuinely worth getting a specialist opinion on whether a crack can be welded rather than assuming the whole unit needs replacing, particularly if the crack is relatively small and localised.
It's also genuinely worth knowing an honest, technical account worth bearing in mind: if the engine is switched off partway through a DPF regeneration cycle, diesel fuel can genuinely leak past the piston rings into the sump and dilute the engine oil — and there's no clear, obvious way to know a regeneration cycle has actually started, making this genuinely difficult to avoid entirely. It's worth keeping oil changes on schedule or slightly earlier if your typical driving is mostly short journeys that don't allow regeneration to complete cleanly and fully.
Volvo XC90 Exhaust System: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.
More Volvo Exhaust System
The same part, covered across other Volvo models.