BMW X1 Exhaust System: Specs, Fitment & Common Faults
On the X1, related engines can genuinely automatically sense when a regen is needed and raise the exhaust temperature themselves.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 247-037 / Walker 05924
| Rear silencer (back box) — aftermarket | Bosal 247-037, 247-413, 247-981 (need accessories); Walker 05924 (1170 mm, code 53, filled); Ernst 251006; MTS 01.60519 (580 mm); Vegaz BS-451 (999 mm), BS-85, BS-83, BS-380 (580 mm), BS-223EBER, BS-260EBER, BS-154IMA (1130 mm); Polmo 03.07 (without cat), 03.28, 03.67 |
|---|---|
| Centre / intermediate silencer — aftermarket | No Bosal/Walker/MTS; Vegaz BS-134, BS-140, BS-136, BS-294IMA (950 mm), BS-295EBER; Polmo 03.51, 03.63, 03.65, 03.123; Ernst 275002/275040 (750 mm repair solutions) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 28948 (250 x 300 mm, 4.1 kg, code 91, with fitting parts); Vegaz BK-315 (4.2 kg, Euro 6), BK-303 (manifold, to Euro 6), BK-897, BK-896 (Euro 6, ECE-R103); BM Catalysts BM92606H (Euro 6, FK92606), BM91351H (Euro 3, non-approved); JMJ 1091548 (595 mm, 3.82 kg, pair); Ernst 465007/465144 and Izawit 31.022 are repair pipes. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines (sDrive18i 136 HP, xDrive20d 190 HP etc.) not mapped to parts |
BMW X1 Exhaust System: The Part That Announces Its Own Problems
On the BMW X1, 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.
BMW X1 Exhaust System: What It Does
The BMW X1'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.
BMW X1 Exhaust System: Watch: Replacing It
F48 X1 axle-back install; shows rear silencer removal and refit.
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A Genuinely Useful Piece of Context Worth Knowing About DPF Regeneration — BMW X1 Exhaust System
If you're worried about the DPF on this diesel, this is genuinely useful to know: related BMW engines can genuinely sense when the DPF needs to regenerate and will automatically raise the exhaust temperature during normal driving, without needing sport mode manually selected.
It's also genuinely worth knowing that if your regular driving is mostly short journeys, giving the car a proper, sustained run at higher revs for around 20 to 30 minutes every six to eight weeks can help ensure the DPF gets a genuine opportunity to regenerate fully.
BMW X1 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 BMW Exhaust System
The same part, covered across other BMW models.