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

OEM Part Numbers

Accuracy note: genuinely worth knowing: catalytic converter theft is a genuinely common issue on the V40 in the UK, since the precious metals inside are valuable and some models sit high enough for easy underneath access — an aftermarket catalytic converter clamp or forensic marking kit is a real, worthwhile deterrent worth considering rather than an unnecessary expense.

The Part That Announces Its Own Problems

Unlike a lot of the parts on this site, this is one 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.

Before you buy: exhaust configuration differs significantly by engine size, fuel type and whether your car has a particulate filter. Always confirm against your VIN before ordering.

What It Does

The exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and on most modern cars, treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions of the same model often use entirely different systems due to different emissions treatment requirements.

Volvo V40 Exhaust System reference plate

Fitment & Compatibility

Exhaust systems differ substantially between the petrol, hybrid and plug-in hybrid versions of the V40, since the hybrid versions integrate differently with the electric motor's contribution to deceleration. Always confirm the exact part fitted to your specific engine and powertrain combination before ordering. Whether you're sourcing a replacement exhaust system for your Volvo V40 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

A Genuinely Useful Piece of Context Worth Knowing About Catalytic Converter Cracks

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.

A genuinely important warranty clarification worth knowing: the catalytic converter is typically covered under an extended 8-year or 80,000-mile warranty, but the DPF specifically is classified as a wear-and-tear item and isn't covered under this same warranty.

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.

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, how difficult this job is to DIY, and which aftermarket brands are worth trusting.

More Volvo Exhaust System

The same part, covered across other Volvo models.