Volvo V40 Exhaust System: Specs, Fitment & Common Faults
On the V40, 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 235-165 / Walker 22947
| Rear silencer (back box) — aftermarket | Bosal 235-165, 235-135, 235-215, 235-007, 235-001 (accessories list); Walker 22947 (1010 mm, code 52), 22577 (960 mm); Ernst 650021; Vegaz VOS-111 (950 mm), VOS-154 (1000 mm, chrome tip), VOS-126, VOS-128; Polmo 31.97, 31.251, 31.252; Izawit 39.008, 39.010, 39.016; MTS 01.60731. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 235-259; Walker 22854 / 22853 (980 mm), 12773, 23210, 13367, 06674; Vegaz SES-35, VOS-55 (centre), VOS-77; MTS 01.52160; Polmo 31.14. (Identical to the S60/V60/XC lists, so probably generic Volvo range.) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 099-273 (Euro 1/2); Walker 20874 (930 mm, code 93), 28532 (600 mm); Ernst 757898 (410 mm, Euro 1/2 kit); Vegaz FK-822 (Euro 4, 650 mm, no DPF), VOK-923 / VOK-929 (Euro 3, 950 mm); JMJ 1080253 (petrol), 290279; BM Catalysts BM91275H (Euro 4); Mostly Euro 1-4 era items, so check against a 2012+ car. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Petrol T2-T5, diesel D2-D4 listed; Treat fitment as unconfirmed. |
Volvo V40 Exhaust System: The Part That Announces Its Own Problems
On the Volvo V40, 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 V40 Exhaust System: What It Does
The Volvo V40'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 V40 Exhaust System: Watch: Replacing It
Rear silencer replacement.
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A Genuinely Useful Piece of Context Worth Knowing About Catalytic Converter Cracks — Volvo V40 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 V40 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.