Mercedes-Benz GLA Exhaust System: Specs, Fitment & Common Faults
A genuinely useful, money-saving finding: a "DPF not working efficiently" fault on related engines is most commonly caused by a failed, comparatively cheap pressure sensor rather than the expensive DPF itself.
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Walker 23091 / MTS 01.65280
| Rear silencer (back box) — aftermarket | Walker 23091; Walker 24332; Vegaz MS-22, MS-2, MS-13IMA, MS-6IMA, MS-340; Polmo 13.11; MTS 01.65280, 01.95530; Hella 8LD 366 033-101 / -141 / -251 / -301 (sets) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 175-003 / 175-023 / 175-123 / 175-185 / 175-191 / 175-429 / 176-421 (accessories needed); Izawit 07.009; MTS 01.53450; Vegaz MS-302, MS-117, MS-145, MS-300; Polmo 13.07, 13.08 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | NAP CAK11533 (Euro 6); Walker 28962, 28196; Vegaz MK-832; BM Catalysts BM80772H (Euro 4); IMASAF 49.15.33 (Euro 6); Oyodo 20N0042-OYO; JMJ 1080252 (OM646), 1080386 (OM651) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | petrol GLA 180-45 AMG, diesel 180-220 CDI, flex; not engine-specific; same generic Mercedes pool. |
Mercedes-Benz GLA Exhaust System: The Part That Announces Its Own Problems
On the Mercedes-Benz GLA, this is one part 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.
Mercedes-Benz GLA Exhaust System: What It Does
The Mercedes-Benz GLA's exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions often use entirely different systems due to different emissions treatment requirements.
Mercedes-Benz GLA Exhaust System: Watch: Replacing It
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A Genuinely Useful, Money-Saving Finding Worth Knowing — Mercedes-Benz GLA 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 GLA 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.