Mercedes-Benz GLC Exhaust System: Specs, Fitment & Common Faults
On the GLC, a "DPF not working efficiently" fault on related engines is genuinely most commonly caused by a failed, comparatively cheap pressure sensor rather than the expensive DPF itself.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Walker 23091 / MTS 01.96340
| Rear silencer (back box) — aftermarket | Walker 23091 (860 mm, code 52); Walker 24332 (1080 mm, code 63); Vegaz MS-22, MS-2, MS-13IMA, MS-332; MTS 01.96340 (760 mm); Polmo 13.11; Izawit 21.047; No Bosal listed. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 176-421, 175-003, 175-023, 175-429 (accessories needed); Polmo 13.07/13.08 (centre); Vegaz MS-117, MS-302; Izawit 07.009; MTS 01.53450. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Walker 28196 (with manifold, 670 mm, code 92); Vegaz MK-377, MK-378, MK-399 (Euro 6), MK-832 (Euro 4, 550 mm); BM Catalysts BM92529H/BM92530H (Euro 6, with FK92529/FK92530), BM80835H; JMJ 1080330 (engine OM 651.940), 1080300 (Euro 4); NAP CAK10455 (OM646/OM611); Ernst 465175 (front repair pipe only). |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | no Bosal or Klarius rear silencer; Hella rear silencers 8LD 366 033-xxx listed. |
Mercedes-Benz GLC Exhaust System: The Part That Announces Its Own Problems
On the Mercedes-Benz GLC, 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.
Mercedes-Benz GLC Exhaust System: What It Does
On the Mercedes-Benz GLC, 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.
Mercedes-Benz GLC Exhaust System: Watch: Replacing It
Aftermarket system, not a repair; weak
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A Genuinely Useful, Money-Saving Finding Worth Knowing — Mercedes-Benz GLC Exhaust System
If a "DPF not working efficiently" fault code has appeared, this is genuinely worth knowing on related diesel engines: this specific code is most commonly caused by a failed DPF differential pressure sensor rather than a genuine fault with the expensive DPF itself. A replacement sensor is comparatively cheap and considered a straightforward DIY-friendly job.
It's also genuinely worth knowing that a 100% DPF fill level triggers a normal regeneration cycle, but at 200% the car's computer actually blocks regeneration entirely, requiring a specialist-only "forced regeneration" instead.
Mercedes-Benz GLC 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.