Volvo XC40 Exhaust System: Specs, Fitment & Common Faults
On the XC40, cracked catalytic converters on related models have genuinely been traced to poor factory welding and successfully repaired by welding rather than full replacement.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 235-143 / Walker 12018
| Rear silencer (back box) — aftermarket | Bosal 235-143, 235-151, 235-193, 235-007; Walker 12018, 22810, 14505, 06625, 23051; Ernst 650052; MTS 01.60731, 01.60729, 01.90610; Vegaz VOS-137; Polmo 31.251, 31.263, 31.12; Izawit 39.010. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 235-259; Walker 22854, 22853, 12773, 23210; MTS 01.52160; Vegaz VOS-55, VOS-159, VOS-77; Polmo 31.14. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 099-273, 090-563 (Euro 1/2, Euro 4 - old); Walker 19185 (905 mm), 23077, 28532; Vegaz FK-822 (Euro 4), VOK-931; JMJ 1091275 (B4164S3), 1080253, 1091660; BM Catalysts BM91275H. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | The parts are the same generic list as S60/V60/XC60 (old-era Euro 1-4) so they look unlikely to be true XC40 (CMA platform) fitments; verify before use. Engines petrol T2-T5, diesel D3-D4, hybrid, EV. |
Volvo XC40 Exhaust System: The Part That Announces Its Own Problems
Where a lot of Volvo XC40 parts fail silently until you spot something visually wrong, this one tends to make noise first — a rattle, a drone, an audible change that wasn't there recently. That's a useful early-warning system if you're paying attention.
Volvo XC40 Exhaust System: What It Does
Away from the engine, through the silencer, and often through a catalytic converter and particulate filter before reaching the tailpipe — that's the Volvo XC40's exhaust job in three steps. Petrol and diesel versions frequently need different systems entirely, since their emissions treatment isn't the same.
Volvo XC40 Exhaust System: Watch: Replacing It
exact model, product video not a how-to
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A Genuinely Useful Piece of Context Worth Knowing About Catalytic Converter Cracks — Volvo XC40 Exhaust System
If a catalytic converter has developed a crack, this is genuinely worth knowing: documented cases on related Volvo models trace this to low-quality factory welding, with owners successfully repairing the crack by welding it themselves rather than paying for full replacement.
It's also worth knowing that stopping the engine partway through a DPF regeneration cycle can let diesel fuel dilute the engine oil, worth bearing in mind if your driving is mostly short journeys.
Volvo XC40 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.