Fiat 500L Exhaust System: Specs, Fitment & Common Faults
On the 500L, 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 148-183 / Walker 22725
| Rear silencer (back box) — aftermarket | Bosal 148-183; Bosal 148-193; Bosal 148-253 (accessories needed); Walker 22725 (810 mm); Walker 23820 (800 mm); Walker 23838 (880 mm, with pipe) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 135-465; Walker 01489 (750 mm, code 52); Vegaz FTS-58 (780 mm); MTS 01.57810 (740 mm); Hella 8LC 366 023-791 (3-piece kit) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 28891 (code 91, 330 mm); Vegaz ALK-957 (Euro 4/5/6, 470 mm); AS 55327 (Euro 5/6, 410 mm); BM Catalysts BM92371H (Euro 6, with FK92371); Hella 8LF 366 055-091 (Euro 5) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Petrol, diesel (1.3/1.6 Multijet), CNG and LPG at category level only. |
A Genuinely Serious, Distinctive Symptom Worth Checking For — Fiat 500L 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 500L Exhaust System: The Part That Announces Its Own Problems
On the Fiat 500L, 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.
Fiat 500L Exhaust System: Watch: Replacing It
Small 500 (not 500L); different platform, loose match
Fiat 500L Exhaust System: What It Does
The Fiat 500L'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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Fiat 500L 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.