Subaru Crosstrek Exhaust System: Specs, Fitment & Common Faults
A genuinely alarming, honest account on related models: a catalytic converter replaced multiple times under warranty, with the same code returning each time, because the root cause was never diagnosed.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 229-683
| Rear silencer (back box) — aftermarket | 2011: Bosal 229-683; Vegaz SAS-18, SAS-5, SAS-60 (581 mm), SZS-50 (880 mm), SAS-44/SAS-55IMA (left rear), SAS-63 (right rear); Polmo 46.20, 46.21, 46.23 (left), 46.25 (AWD); Izawit 45.006, 45.007 (660 mm). 2017-: Bosal 229-683; Vegaz SAS-56, SAS-18, SZS-50 etc.; Polmo 46.01, 46.10, 46.20-46.25; Izawit 45.006, 45.007 |
|---|---|
| Centre / intermediate silencer — aftermarket | No branded centre silencer is listed for this car in UK catalogues — order the centre section against your VIN |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: both gens: Bosal 090-640 (Euro 3), 090-207 (Euro 5); Walker 28747 (450 mm, code 91), 28249 (740 mm, code 92); Vegaz SAK-925 (670 mm, Euro 4), SAK-909, SAK-913 (880 mm); BM Catalysts BM91976H, BM80563H (Euro 5), BM91767H; JMJ 1091581 (EJ20/EJ201/EJ251), 1091686 |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Left rear / right rear / centre positions vary - check position. XV1 petrol 1.6/2.0 plus 2.0D (GPD), hybrid, bi-fuel; XV GT petrol and e-BOXER only. Cat refs look generic (not engine-specific). |
Subaru Crosstrek Exhaust System: The Part That Announces Its Own Problems
On the Subaru Crosstrek, 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.
Subaru Crosstrek Exhaust System: What It Does
The Subaru Crosstrek'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.
Subaru Crosstrek Exhaust System: Watch: Replacing It
Muffler removal and replacement on 2013-2017 Crosstrek, also covering the Impreza hatch
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A Genuinely Alarming, Honest Real Account Worth Knowing — Subaru Crosstrek Exhaust System
If you're facing a recurring P0420 code and catalytic converter replacement, this is genuinely worth knowing before agreeing to another straight swap: documented cases on related Subaru models describe the catalytic converter being replaced under warranty multiple times, with the exact same code returning each time, because the underlying root cause was never actually diagnosed — only the symptom repeatedly swapped out.
It's also genuinely worth knowing that P0420 doesn't automatically mean the catalytic converter itself has failed — the code relates to catalyst efficiency falling below an expected threshold, which can be triggered by several other causes without the converter being physically damaged at all.
Subaru Crosstrek 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 Subaru Exhaust System
The same part, covered across other Subaru models.