Volkswagen Caddy Exhaust System: Specs, Fitment & Common Faults
If your Caddy is a diesel that had the Dieselgate emissions software update, this is worth understanding — a documented pattern links the fix to accelerated EGR failure afterward.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 154-317 / Walker 21950
| Rear silencer (back box) — aftermarket | Bosal 154-317, 233-531, 233-735, 233-607 (accessories list); Walker 21950 (530 mm), 70615 (840 mm), 22059 (810 mm); Ernst 112215 (780 mm); Asmet 03.097, 04.083; MTS 01.90540, 01.95530, 01.69030; Vegaz VS-352AT, VS-112, VS-191; Polmo 30.218, 30.27, 30.09 (with cat), 01.124 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 105-109, 233-577; Walker 21575 (790 mm), 71341 (1000 mm); Ernst 177092; MTS 01.59790, 01.50577; Vegaz VS-111, VS-293AT, VS-156, VS-222; Polmo 30.221, 01.106, 01.104 (with cat); Izawit 18.022, 15.009, 23.001. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 099-046 (Euro 3/4), 090-037 (Euro 4); Walker 28102, 20196, 20639 (code 91, with fitting parts); JMJ 1091506 (BXW/BCA/BUD), 1080049 (AEY), 1091391 (BSF/BSE/BGU), 1091544; BM Catalysts BM91391H, BM91588H; Polmo 24.61 (repair pipe). JMJ engine codes are old-era. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines 1.0/1.2/1.4 TSI, 1.6, 1.6/2.0 TDI, e-Caddy, TGI CNG; no per-part split. |
Worth Knowing: A Documented Link Between the Emissions Fix and EGR Wear
Worth understanding if you own a diesel VW that received the emissions compliance software update following the 2015 "Dieselgate" scandal: a documented pattern of owner reports links this update to accelerated EGR valve and DPF wear afterward. The technical explanation given is that the software fix increased how frequently and heavily the EGR system was used to reduce NOx emissions, which in turn increases the rate of diesel particulate matter produced, shortening the working life of the EGR valve, cooler, and DPF compared with before the update. Independent reporting has documented numerous cases of the EGR valve or cooler failing within a relatively short time of the update being applied — VW's response in a number of these cases has reportedly included replacing the EGR unit itself, sometimes at no cost, treating it as a related consequence of the fix.
Separately, and relevant regardless of whether the recall applies to your car: the EGR cooler on many 1.6 and 2.0 TDI engines is mounted at the rear of the engine, making it a genuinely difficult and expensive part to access — independent garages and forum reports consistently describe this as an unreliable component that can fail again within a few years even after replacement, with labour-heavy repair quotes commonly exceeding £1,000. A blocked DPF, meanwhile, is overwhelmingly a short-journey problem — the filter needs sustained running at roughly 2,000-2,500rpm for 20-30 minutes to regenerate properly, and a diesel used mainly for short, low-speed trips may never complete this cycle, leading to warning lights, reduced power, and eventually a blockage requiring active intervention.
Volkswagen Caddy Exhaust System: The Part That Announces Its Own Problems
On the Volkswagen Caddy, 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.
Volkswagen Caddy Exhaust System: Watch: Replacing It
Rear box fitted; aftermarket box rather than OE replacement.
Volkswagen Caddy Exhaust System: What It Does
On the Volkswagen Caddy, 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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Volkswagen Caddy 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 Volkswagen Exhaust System
The same part, covered across other Volkswagen models.