Car Parts Guide
EXHAUST SYSTEM Mazda CX-3 · PARTS GUIDE

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 of a car exhaust system Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: exhaust and catalytic converter part numbers vary significantly by engine on the CX-3 — a part correct for one engine variant will very likely not fit or meet emissions requirements on another, so confirm your exact engine code via VIN before ordering, particularly for the catalytic converter itself.
Front pipe with catalytic converter (petrol)Genuinely a different part from the diesel front pipe below — confirm your exact engine code before ordering
Front pipe with diesel particulate filter (diesel, where fitted)A genuinely different assembly from the petrol cat pipe, combining catalytic and particulate filtration in one unit
Centre/intermediate pipeA genuinely separate section from both the front pipe and rear silencer
Rear silencer, front-wheel driveA genuinely different silencer and mounting arrangement applies versus AWD variants — the underbody routing differs enough that the two aren't interchangeable
Rear silencer, AWDA genuinely different silencer and mounting from the front-wheel-drive version above, to clear the rear differential and driveshaft routing

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.

Worth knowing about a genuine, free proactive fix Mazda has carried out in the past: in 2018, Mazda cleaned inlet manifolds at their own expense across a range of diesel models and made a corresponding ECU adjustment, worth being aware of as a data point on how Mazda has handled emissions-related issues previously.

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.

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.

Mazda CX-3 Exhaust System reference plate
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.

Shop for This Part on eBay

MAZDA CX-3 rear exhaust system MAZDA CX-3 rear exhaust system GBP 115.10 MAZDA CX-3 DK Exhaust System Gasket P54940305 NEW GENUINE MAZDA CX-3 DK Exhaust System Gasket P54940305 NEW GENUINE GBP 28.56 MAZDA CX-3 GENUINE REAR EXHAUST MUFFLER SYSTEM 6B03 PEG8 #117 MAZDA CX-3 GENUINE REAR EXHAUST MUFFLER SYSTEM 6B03 PEG8 #117 GBP 139.00 EXHAUST SYSTEM GASKET/SEAL FITS MAZDA 3 3/HATCHBACK 6 6/KOMBI CX-3 CX-30 CX-5 EXHAUST SYSTEM GASKET/SEAL FITS MAZDA 3 3/HATCHBACK 6 6/KOMBI CX-3 CX-30 CX-5 GBP 19.42 MAZDA 2 3 5 CX-3 CX-5 Exhaust System Hanger Holder Mount Support BP4740061 MAZDA 2 3 5 CX-3 CX-5 Exhaust System Hanger Holder Mount Support BP4740061 GBP 10.00 EXHAUST SYSTEM MOUTING FA1 783-714 FOR MAZDA CX-5,3,6,CX-3,2,CX-30 EXHAUST SYSTEM MOUTING FA1 783-714 FOR MAZDA CX-5,3,6,CX-3,2,CX-30 GBP 18.85 Holder, exhaust system for MAZDA 2 3 6 CX-3 FA1 783-914 Holder, exhaust system for MAZDA 2 3 6 CX-3 FA1 783-914 GBP 13.87 7G11PEG8 rear exhaust tailpipe MAZDA CX-3 SENSES EDITION 2WD 2017 1130503 7G11PEG8 rear exhaust tailpipe MAZDA CX-3 SENSES EDITION 2WD 2017 1130503 GBP 160.58

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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.