Citroen C5 Aircross Exhaust System: Specs, Fitment & Common Faults
A genuinely honest fact: the DPF additive never burns off, meaning even excellent driving habits can't prevent an eventual, expected filter service — plus a real warning against illegal DPF deletion.
Illustration for editorial purposes
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OEM Part Number: 9839652080 (diesel DPF / SCR unit) — rear silencer (aftermarket) Bosal 135-541 / Walker 72183
| Rear silencer (back box) — aftermarket | Bosal 135-541; Bosal 135-547; Bosal 190-363 (accessories needed); Walker 72183 (870 mm, code 52); Walker 71185 (850 mm, code 52); Walker 21223 (660 mm, code 52) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 135-465; Bosal 135-371 (accessories needed); Walker 01489 (750 mm, code 52); Walker 28832 (930 mm, code 52) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: AS 28694 (OBD, 600 mm); Vegaz CSCR-005QP (SCR, Euro 6); NAP CAK10514 (diesel, 420 mm, engine codes 9HZ/9HV/9HY/9HX DV6); NAP CAK10515 (Euro 5, EP6CDT/N18B16A); Walker 28964 (code 91, 555x245x420 mm); OE Citroen/Peugeot 9839652080 |
| Genuine (OE) numbers quoted | 9839652080 (Citroen/Peugeot SCR with DPF/SDPF, Euro 6, diesel) |
| Fitment notes | Petrol, diesel and plug-in hybrid listed at category level only; no Bosal converter listed. |
A Genuinely Important, Honest Fact: Good Driving Habits Alone Won't Prevent Eventual DPF Service — Citroen C5 Aircross Exhaust System
It's worth knowing something distinct from the usual "just drive faster to regenerate" advice: diesel particulate filters on this platform rely on an additive (commonly referred to as Eolys, or cerine) injected into the fuel to help the trapped soot burn at a lower temperature during regeneration. This additive itself, however, never burns off — it accumulates as a genuine ash residue inside the filter permanently, regardless of how well the car has been driven. This means even a diesel driven mostly on motorways with excellent regeneration habits will eventually need the DPF professionally cleaned or replaced simply due to this ash buildup, typically somewhere in the region of 100,000-120,000 miles — this isn't a fault or a sign of poor maintenance, but a genuine, expected part of diesel particulate filter technology that good driving habits alone can't prevent indefinitely.
If you're chasing a specific EGR-related fault, real fault codes worth knowing include P0401 (insufficient EGR flow) and P0405 (EGR position sensor signal fault) — worth mentioning to whoever is diagnosing the car, since these point toward different specific parts of the system rather than a generic "EGR problem."
Citroen C5 Aircross Exhaust System: The Part That Announces Its Own Problems
On the Citroen C5 Aircross, you'll typically hear this fault developing long before you'd ever see it — a new rattle, an odd drone, noise levels creeping up from one week to the next. That early audible warning is a genuine head start on catching the problem before it worsens.
Citroen C5 Aircross Exhaust System: Watch: Replacing It
C5 Aircross shares the PSA EMP2 platform with the 308 / 3008; shows the exhaust hangers and mounting rather than a box swap
Citroen C5 Aircross Exhaust System: What It Does
The Citroen C5 Aircross's exhaust does more than just carry gases away from the engine — it also handles noise reduction through the silencer and emissions treatment via a catalytic converter and particulate filter. That's why petrol and diesel versions can use entirely different systems.
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Citroen C5 Aircross 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 Citroen Exhaust System
The same part, covered across other Citroen models.