Audi Q5 Exhaust System: Specs, Fitment & Common Faults
On the Q5, 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 | Bosal 105-017, 105-137, 105-031 (need accessories); Walker 13379 (1050 mm, 5.22 kg, code 53, filled); Vegaz AS-313AT (1060 mm), AS-44 (940 mm), VS-37 (1040 mm), AS-172 (920 mm), AS-170IMA (950 mm), AS-190 (1070 mm); Polmo 01.124 (with cat) / 01.14 (without) / 01.05 (manual); Izawit 15.003 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 105-109, 105-159, 105-111, 220-015; Walker 21903 (850 mm, code 52), 24145 (900 mm, code 62), 21575 (790 mm, code 52), 22719 (760 mm, code 62); Ernst 233026 (1080 mm), 153003, 114172 (900 mm), 202022; Asmet 21.009; MTS 01.59810 (900 mm), 01.59790 (880 mm), 01.53750 (1140 mm); Polmo 01.251/01.62/01.106/01.104 (with cat), 01.08 (without); Izawit 15.009, 18.072, 15.033. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 28853 (610 mm, code 91, with fitting parts), 20825 (400 mm, code 91, no pipe); BM Catalysts BM92108H, BM92109H, BM92110H (Euro 5), BM31130H (SCR Euro 6), BM91518H/BM91391H/BM90529H (Euro 4, non-approved); EEC AU6060T (620 mm, Euro 5); Vegaz AK-890 (620 mm, Euro 5, OBD), VK-976AT; JMJ 1091592 (620 mm), 1091579 (900 mm; BAG/BCA/BUD/BLP/BKG), 1091391 (1050 mm; BSF/BSE/BGU), 1090954 (415 mm). |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines (2.0 TFSI to 3.0 TDI) not mapped per part; JMJ engine codes are petrol 1.8/2.0 FSI-era and may not be Q5. |
Audi Q5 Exhaust System: The Part That Announces Its Own Problems
On the Audi Q5, 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 Q5 Exhaust System: What It Does
The Audi Q5'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 Q5 Exhaust System: Watch: Replacing It
SQ5 on the same 8R platform; centre section/resonator work, not a standard Q5 silencer swap.
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A Genuinely Useful Piece of Context Worth Knowing About DPF Diagnosis — Audi Q5 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 Q5 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.