Audi Q3 Exhaust System: Specs, Fitment & Common Faults
On the Q3, power loss and smoke that looks like DPF failure on related models can genuinely be a faulty back pressure sensor.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 105-017 / Walker 13379
| Rear silencer (back box) — aftermarket | Walker 13379 (1050 mm, OE 893253078C); Bosal 105-017, 105-127, 105-031, 105-137; Vegaz VS-37 (1040 mm), AS-44, AS-86IMA; Polmo 01.124 (with cat), 01.14 (without cat), 01.05; Izawit 15.003 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 233-567, 233-613, 233-545, 105-109, 220-015; Walker 21575, 21903 (code 52), 22719, 24145 (code 62); Ernst 161046, 161022, 114172, 202022; MTS 01.59790, 01.59810; Polmo 01.62, 01.104, 01.106; Izawit 15.009, 18.072; Vegaz VS-293AT |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | BM Catalysts BM31200H (Euro 6, with FK31200/PP31200A/B); Vegaz VSCR-008 (Euro 6 particulate filter), VK-976AT (to Euro 4); Walker 20825 (400 mm, code 91); NAP CAK10777 (BGU/BSE/BSF); Most JMJ entries (e.g. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Treat catalyst refs with caution. |
Audi Q3 Exhaust System: The Part That Announces Its Own Problems
On the Audi Q3, sound is usually the first clue here, ahead of any visual sign — a rattle, a drone, noise that's crept in gradually or arrived overnight. It's one of the more forgiving faults in that sense, since your ears will likely flag it before it becomes a bigger problem.
Audi Q3 Exhaust System: What It Does
The Audi Q3's exhaust system handles three things at once: clearing burnt gases from the engine, cutting noise via the silencer, and treating emissions through a catalytic converter and particulate filter. Because petrol and diesel emissions requirements differ, it often uses genuinely different exhaust systems depending on engine type.
Audi Q3 Exhaust System: Watch: Replacing It
Generic VW group (same MQB-era/VAG parts family); not Q3-specific, weak match
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A Genuinely Useful Piece of Context Worth Knowing About DPF Diagnosis — Audi Q3 Exhaust System
If you're facing power loss and heavy smoke, this is genuinely worth knowing before assuming the DPF itself has failed: documented cases on related Audi models describe these exact symptoms traced to a faulty exhaust back pressure sensor giving incorrect readings, rather than the DPF itself, worth checking this cheaper component first.
It's also genuinely worth knowing an important legal clarification: removing emissions control equipment fitted for type approval isn't legal in the UK, regardless of whether a "DPF delete" currently passes an MOT test.
Audi Q3 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 Audi Exhaust System
The same part, covered across other Audi models.