Peugeot 508 Exhaust System: Specs, Fitment & Common Faults
A genuine warning worth knowing on diesel 508s: DPF deletion is illegal and can be genuinely dangerous — one real case saw exhaust gas smell in the cabin afterward.
Illustration for editorial purposes
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Peugeot 508 Exhaust System: OEM Part Number
| Front pipe with catalytic converter (petrol) | Genuinely a different part from the diesel front pipe below — confirm your exact engine code before ordering |
|---|---|
| Front pipe with diesel particulate filter (diesel, where fitted) | A genuinely different assembly from the petrol cat pipe, combining catalytic and particulate filtration in one unit — not sold as two separate parts |
| Centre/intermediate pipe | A genuinely separate section from both the front pipe and rear silencer, confirmed shared across the wider PSA Group range in many cases |
| Rear silencer | Confirm your exact engine and trim, since PSA Group used multiple distinct rear silencer references across most model generations |
A Genuine Warning Worth Knowing: DPF Deletion Is Illegal and Can Be Genuinely Dangerous — Peugeot 508 Exhaust System
If you're facing a costly DPF or EGR repair and have come across "DPF deletion" as a cheaper alternative, this is worth understanding properly before considering it: removing or gutting the DPF filter is illegal in the UK and will cause an automatic MOT failure once detected — testers now specifically check for this. Beyond the legal risk, it's worth knowing about a genuinely concerning real case: one documented DPF deletion also involved the EGR valve being blocked to allow only fresh air intake, after which the owner began smelling exhaust gas inside the cabin while driving — a real, potential carbon monoxide exposure risk, not just an unpleasant smell. Whatever the cost pressure, a genuine repair rather than a deletion is worth pursuing given both the legal exposure and this kind of real safety risk.
A blocked DPF is overwhelmingly a short-journey problem — sustained motorway driving at around 60mph for at least 15 minutes allows a mildly blocked filter to complete a regeneration cycle and clear the fault naturally. If an "anti-pollution fault" message appears alongside a sudden loss of power, the car has entered limp mode as a protective measure — worth addressing promptly rather than continuing to drive on it.
Peugeot 508 Exhaust System: The Part That Announces Its Own Problems
Where a lot of Peugeot 508 parts fail silently until you spot something visually wrong, this one tends to make noise first — a rattle, a drone, an audible change that wasn't there recently. That's a useful early-warning system if you're paying attention.
Peugeot 508 Exhaust System: What It Does
Away from the engine, through the silencer, and often through a catalytic converter and particulate filter before reaching the tailpipe — that's the Peugeot 508's exhaust job in three steps. Petrol and diesel versions frequently need different systems entirely, since their emissions treatment isn't the same.
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Peugeot 508 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 Peugeot Exhaust System
The same part, covered across other Peugeot models.