Knowledge base
Mercedes-Benz blog & knowledge base
Practical guides on Mercedes servicing, diagnostics, common faults and ownership — written by the technicians doing the work.
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faults
Mercedes OM642 V6 Diesel: The Definitive Fault List Every Owner Needs
The OM642 V6 diesel powers the E350, C350, ML350, GL350 and S350. It is fundamentally strong but has five well-known weak points that every owner should know about before the…
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faults
Mercedes C-Class W204 Common Faults: The 8 Problems Every Owner Should Know About
The W204 is widely regarded as one of the most reliable modern Mercedes — but it has a handful of well-documented faults that every owner should budget for. Here are…
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faults
Mercedes C-Class W205 Common Faults: A 2026 Owner's Guide
The W205 C-Class improved on the W204 in almost every way — but it introduced new electronic complexity and an AdBlue system that has become its most common and expensive…
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faults
Mercedes 7G-Tronic Conductor Plate Failure: Symptoms, Diagnosis & What It Costs to Fix
The 7G-Tronic conductor plate is the most common electronic failure on this gearbox. Here is how to recognise the symptoms, confirm the fault, and what a proper repair costs in…
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diagnostics
Mercedes Limp Mode: What It Means, What Triggers It & Exactly What to Do
When your Mercedes suddenly loses power and refuses to shift above 2nd gear, it has entered limp mode. Here is what is actually happening, what likely triggered it, and exactly…
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faults
Mercedes CLA Common Faults (C117 & C118): What Goes Wrong on the Four-Door Coupe
The CLA shares its platform with the A-Class, which means it shares the same Renault-sourced engine weaknesses — plus a few unique to the four-door coupe body.
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diagnostics
Mercedes Check Engine Light: The 12 Most Common Causes & What Each One Costs to Fix
A check engine light on a Mercedes can mean anything from a loose fuel cap to a failing timing chain. Here is the complete guide to what each fault code…
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faults
Mercedes A-Class Common Faults (W176 & W177): The Problems We See Most
The A-Class brought Mercedes to a younger audience — but the W176 shared its engine with Renault and the W177 introduced new electronic complexity. Here are the faults to watch…
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diagnostics
Mercedes Dashboard Warning Lights: The Complete Guide to Every Symbol & What to Do
Modern Mercedes dashboards can display dozens of warning lights. Here is a complete guide to what every symbol means, which ones require you to stop immediately, and the Mercedes-specific warnings…
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