Mazda CX-3 Exhaust System: Specs, Fitment & Common Faults
Worth knowing as context: Mazda's 2.2 diesel engine, used across its larger models, has been linked to oil contamination described as a known manufacturing fault, with a real £9,000 engine replacement quote.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 171-045 / Walker 71393
| Rear silencer (back box) — aftermarket | Walker 71393 (820 mm, code 52); Walker 71394; Walker 21303; Bosal 171-045 / 171-055 / 154-923 (accessories needed); Ernst 311199, 310161; Vegaz MZS-134 (930 mm), FS-621; MTS 01.60387, 01.94640, 01.92260, 01.92280 |
|---|---|
| Centre / intermediate silencer — aftermarket | Walker 23109 (code 63); Bosal 171-377; Vegaz MZS-16, MZS-156 (manual), MZS-198, MZS-199, MZS-169; Hella 8LC 366 024-061 / -071; Izawit 17.079 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-003 (Euro 4); Walker 28532, 28109, 20758; Quinton Hazell QCAT90454H; NAP CAK10261 (Euro 4, M7JA etc.); JMJ 1091529; BM Catalysts BM91264H; Ernst 313476 (repair pipe) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | engines 1.5/2.0 SKYACTIV-G, 1.5/1.8 SKYACTIV-D, 2.0 flex; cat list is the same generic Mazda pool (includes Euro 2 NAP items, not CX-3). |
A Genuinely Useful Piece of Context Worth Knowing About Mazda's Diesel Range — Mazda CX-3 Exhaust System
If you're cross-shopping against a larger diesel Mazda, or considering a used one from the same range, this is genuinely worth knowing: Mazda's 2.2 diesel engine, used across the CX-5, Mazda 6, and Mazda 3, has been linked in documented cases to unburnt fuel contaminating the engine oil during DPF regeneration cycles, with two independent mechanics in one case describing it as a known manufacturing fault. Mazda quoted around £9,000 for a full replacement engine in that documented case — worth knowing as general context even if your own car doesn't use this specific engine.
It's also worth knowing that regular use of a fuel additive alongside genuinely sustained motorway-speed driving occasionally is a real, practical way to help any DPF-equipped diesel regenerate properly, worth building into your routine if your driving is mostly short, local journeys.
Mazda CX-3 Exhaust System: The Part That Announces Its Own Problems
On the Mazda CX-3, this is one of the few parts where your ears will catch a problem before your eyes do — a new rattle, a drone, noise that simply wasn't there a week ago. That's a genuine advantage, since it gives you an early warning most other faults don't offer.
Mazda CX-3 Exhaust System: Watch: Replacing It
Aftermarket exhaust install on CX-3
Mazda CX-3 Exhaust System: What It Does
On the Mazda CX-3, burnt gases leave the engine through the exhaust system, which quiets them via the silencer and treats emissions through a catalytic converter and particulate filter before anything exits the tailpipe. Petrol and diesel versions frequently use entirely different systems, since their emissions treatment needs aren't the same.
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Mazda CX-3 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 Mazda Exhaust System
The same part, covered across other Mazda models.