Mercedes-Benz C-Class Exhaust System: Specs, Fitment & Common Faults
Confirmed: a "DPF not working efficiently" fault is most commonly caused by a failed, comparatively cheap pressure sensor rather than the expensive DPF itself — worth checking this DIY-friendly part first, plus a finding that regeneration won't happen below around 15 litres of fuel.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Walker 23091
| Rear silencer (back box) — aftermarket | Walker 23091; Walker 24332; Vegaz MS-332, MS-340, MS-22, MS-2, MS-13IMA, MS-6IMA; Polmo 13.11; Hella 8LD 366 033-101 / -141 / -251 / -301 (sets). Identical to the A-Class list, so likely generic. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 175-023 (accessories needed); Ernst 352291 / 352123 / 352017 (940 mm), 351119 / 351072 (930 mm); Vegaz MS-331 (931 mm), MS-278 / MS-278IMA (940 mm), MS-302 (925 mm), MS-339, MS-336; Polmo 13.170; Izawit 07.072 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-177 (Euro 4/5); NAP CAK11581 (Euro 6, 480 mm), CAK11569 (Euro 6, 460 mm); Vegaz MK-378 / MK-377 (Euro 6), MK-393 (Euro 5); BM Catalysts BM92529H / BM92530H; Walker 28196, 20726; JMJ 1080386 (OM651 engine codes); Quinton Hazell QCAT80461H |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | middle-silencer list is W205-specific (940 mm range); not engine-specific. |
Mercedes-Benz C-Class Exhaust System: The Part That Announces Its Own Problems
On the Mercedes-Benz C-Class, most faults are things you'd spot visually first, but this one usually announces itself acoustically — a rattle, a drone, a noticeable jump in noise levels. That's actually helpful, since it means you'll likely notice trouble well before it gets serious.
Mercedes-Benz C-Class Exhaust System: What It Does
Three jobs happen inside the Mercedes-Benz C-Class's exhaust system: routing burnt gases away from the engine, quieting them through the silencer, and treating emissions via a catalytic converter and particulate filter. Petrol and diesel variants often need completely different systems to meet their respective emissions requirements.
Mercedes-Benz C-Class Exhaust System: Watch: Replacing It
Rear exhaust swap on W205 C220d; alt: Mercedes C300 W205 Muffler Hack https://www.youtube.com/watch?v=WEVB77A-x_o
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Confirmed: A Genuine, Money-Saving Finding Worth Knowing — Mercedes-Benz C-Class Exhaust System
If a "DPF not working efficiently" fault code has appeared, this is genuinely worth knowing on this diesel engine: this specific code is most commonly caused by a failed DPF differential pressure sensor, or a blockage in the pipes connecting it, rather than a genuine fault with the expensive DPF itself. A replacement sensor is comparatively cheap and considered a straightforward DIY-friendly job, worth checking this specific sensor and its connecting pipes for blockages before assuming a full, expensive DPF replacement is necessary.
It's also genuinely worth knowing that the vehicle remains drivable with this fault present, though it will likely enter a reduced power "limp" mode, and ignoring the warning can eventually lead to a completely clogged DPF and potential turbocharger damage from excessive exhaust backpressure.
Mercedes-Benz C-Class 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 Mercedes-Benz Exhaust System
The same part, covered across other Mercedes-Benz models.