Fiat 500 (Petrol) Exhaust System: Specs, Fitment & Common Faults
On the classic petrol 500, if Multijet diesel, excess fuel from DPF regeneration can genuinely sink into the sump and cause the oil level to actually rise.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 148-175 / Walker 22693
| Rear silencer (back box) — aftermarket | Bosal 148-175; Bosal 148-183 (accessories needed); Walker 22693 (820 mm, code 52); Walker 23838 (880 mm, with pipe, code 52); Walker 22725 (810 mm, code 52); Walker 24158 (380 mm, code 51, no tip); Polmo 07.420 and Izawit 14.603 suit cat-equipped cars. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 135-465; Walker 01489 (750 mm, code 52); MTS 01.57810 (740 mm); Izawit 14.771; Vegaz FTS-325 (760 mm) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 28325 (code 91, 425 mm, with manifold); NAP CAK10851 (Euro 4, 440 mm); NAP CAK10294 (Euro 6, 600 mm, 10.2009-09.2013); Hella 8LF 366 055-091 (Euro 5, one-piece manifold); BM Catalysts BM80434H (Euro 4, with FK80434) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | no twin-exit mentioned; parts not mapped to engines. |
A Genuinely Serious, Distinctive Symptom Worth Checking For — Fiat 500 (Petrol) Exhaust System
If your Multijet diesel is going through DPF regeneration cycles, this is genuinely worth knowing and checking for regularly: excess fuel injected during regeneration can work its way past the piston rings and sink into the sump, contaminating the oil and — distinctively — causing the oil level to genuinely rise rather than fall. Worth checking your dipstick periodically for a rising level specifically.
It's also genuinely worth knowing that regular oil changes, at or before the recommended interval, are particularly important on this engine given how directly oil condition relates to this failure mode.
Fiat 500 (Petrol) Exhaust System: Watch: Replacing It
Rear box replacement on a Fiat 500
Fiat 500 (Petrol) Exhaust System: The Part That Announces Its Own Problems
On the Fiat 500 (Petrol), this is one part where you'll usually hear the fault before you see it — a rattle, a drone, a sudden increase in noise that wasn't there last week. That's actually useful, since it gives you a head start on catching problems early.
Fiat 500 (Petrol) Exhaust System: What It Does
The Fiat 500 (Petrol)'s exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions often use entirely different systems due to different emissions treatment requirements.
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Fiat 500 (Petrol) 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 Fiat Exhaust System
The same part, covered across other Fiat models.