Car Parts Guide
EXHAUST SYSTEM Mazda CX-5 · PARTS GUIDE

Mazda CX-5 Exhaust System: Specs, Fitment & Common Faults

A genuinely severe, real issue on diesel models: two independent mechanics described diesel fuel contaminating the oil as a known manufacturing fault, with Mazda quoting £9,000 for a replacement engine.

Illustration of a car exhaust system Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: exhaust systems on the CX-5 are typically sold in sections (manifold/downpipe, catalytic converter, centre section, rear silencer) rather than as one single part — check which specific section has actually failed (a rattle often points to a loose heat shield rather than the exhaust itself) before ordering the whole system unnecessarily.
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 Severe, Real Issue Worth Understanding on Diesel Models — Mazda CX-5 Exhaust System

This is genuinely important to understand on the 2.2 diesel engine specifically: unburnt diesel fuel injected during a DPF regeneration cycle can, in some documented cases, work its way past the piston rings and into the engine oil rather than being fully burned off, progressively diluting and contaminating it. One documented case saw two independent mechanics both describe this as a known manufacturing fault affecting these diesel engines, with the contaminated oil eventually causing the engine to knock and fail entirely — Mazda themselves quoted around £9,000 for a full replacement engine in this case. Staying on top of oil changes at or before the recommended interval, and being aware that a diesel smell on the dipstick or a rising oil level between changes can be an early warning sign of this specific issue, is genuinely worth taking seriously rather than dismissing as normal.

Worth knowing about a genuine, real, and 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, around the same period that emissions scrutiny across the industry increased significantly following other manufacturers' issues. If you're facing intake or EGR-related carbon buildup and have an older diesel that predates this, it's worth asking a dealer whether this specific work was ever carried out on your car.

It's also worth knowing about a genuinely specific, distinctive symptom combination worth recognising: a warning specifically referencing "SCBS forward malfunction" appearing during deceleration or engine braking, alongside a general engine warning light, has been documented as pointing toward significant carbon buildup in the intake manifold requiring a full decoke, along with a compromised EGR cooler — worth mentioning this specific symptom pattern to a specialist if you're getting an unusual combination of warnings during deceleration specifically.

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-5 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

Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA4002 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA4002 GBP 167.22 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA515 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA515 GBP 168.40 MAZDA CX-5 MK2 Exhaust System Bracket PY8940390 NEW GENUINE MAZDA CX-5 MK2 Exhaust System Bracket PY8940390 NEW GENUINE GBP 29.14 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA4002 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA4002 GBP 167.22 Complete Exhaust System 2018 MAZDA CX-5 KF 2.2 d Complete Exhaust System 2018 MAZDA CX-5 KF 2.2 d GBP 299.00 MAZDA CX5 2.0 KE GH 2WD AWD 165HP 160HP 11>17 Exhaust Rear Silencer MAZDA CX5 2.0 KE GH 2WD AWD 165HP 160HP 11>17 Exhaust Rear Silencer GBP 159.00 exhaust catalytic converter MAZDA CX-5 KE 2012- 2191 CC 150 2012 2716885 exhaust catalytic converter MAZDA CX-5 KE 2012- 2191 CC 150 2012 2716885 GBP 398.78 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA515 Rear Muffler Exhaust Silencer 1200mm Length Fits Mazda CX-5 EEC EMA515 GBP 168.40

As an eBay Partner, CarUnited may earn commission from qualifying purchases shown above. Listings and pricing are pulled live from eBay and may vary.

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.

Read our full Mazda CX-5 review

More Mazda Exhaust System

The same part, covered across other Mazda models.