Vauxhall Astra Exhaust System: Specs, Fitment & Common Faults
A confirmed Vauxhall recall covers DPF diagnostics on diesel Astras — plus a genuine money-saving find: a £1,400+ EGR cooler quote that a £36-80 repair kit can often fix instead.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 185-469 / Walker 23146
| Rear silencer (back box) — aftermarket | Walker 23146 (770mm), 70339 (950mm), 23138, 23114 (910mm), 23239 (850mm), all code 52; Bosal 185-469, 185-475, 185-099, 185-459; Izawit 21.004, 21.156, 21.026, 21.260; Vegaz OS-581, OS-421, OS-299 (no Polmo) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 200-825, 200-269, 278-135; Vegaz OS-278, IS-110, RS-318; Polmo 21.282; Izawit 21.087, 21.070 (same set as Adam) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-157 (Euro 4); Walker 28819 (450mm), 28818 (370mm), 20873, 20067; Vegaz OK-354QP (Euro 6); BM Catalysts BM92311H; JMJ 1091737 (others old engine codes) |
| Genuine (OE) numbers quoted | 5852595 (Izawit 21.087 middle); 855184 (Walker 20067 converter) |
| Fitment notes | no twin-exit info; middle silencer list is generic Vauxhall set |
Confirmed: A Genuine Vauxhall Recall Covering DPF Diagnostics on Astra and Mokka Diesels — Vauxhall Astra Exhaust System
Vauxhall has confirmed a recall covering certain Astra and Mokka diesel models for an error in the exhaust gas temperature diagnostics that can prevent the Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) from functioning correctly — potentially resulting in a blocked DPF and DOC. The remedy is a free Engine Control Module reprogram carried out at any authorised Vauxhall dealer. If you're looking at a used diesel Astra or Mokka, checking whether this specific recall has been actioned via your registration is genuinely worth doing, since an unaddressed diagnostic fault can contribute directly to the DPF blockage issues discussed below.
Vauxhall Astra Exhaust System: The Part That Announces Its Own Problems
On the Vauxhall Astra, this is one of the few parts where your ears will catch a problem before your eyes do — a new rattle, a drone, noise that simply wasn't there a week ago. That's a genuine advantage, since it gives you an early warning most other faults don't offer.
Vauxhall Astra Exhaust System: Watch: Replacing It
Rear back box swap on the Astra K. Alternative: https://www.youtube.com/watch?v=uzAimoyAVs4 (back box delete).
Vauxhall Astra Exhaust System: What It Does
On the Vauxhall Astra, burnt gases leave the engine through the exhaust system, which quiets them via the silencer and treats emissions through a catalytic converter and particulate filter before anything exits the tailpipe. Petrol and diesel versions frequently use entirely different systems, since their emissions treatment needs aren't the same.
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Vauxhall Astra 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 Vauxhall Exhaust System
The same part, covered across other Vauxhall models.