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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ownership
Mercedes Apple CarPlay Retrofit: Which Head Units Support It & What It Costs to Activate
Adding Apple CarPlay to an older Mercedes is one of the most popular retrofits we do. But not every head unit supports it. Here is exactly which NTG versions work,…
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ownership
Mercedes New Key Programming: What It Costs, How It Works & What to Do If All Keys Are Lost
Losing your only Mercedes key is a genuine crisis — the car will not start without a coded key, and the process to get a new one involves Mercedes security…
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faults
Mercedes SBC Brake System: The Complete Guide to Service, Failure & Costs (W211, W220, SL R230)
The SBC electronic brake system on the W211 E-Class, W220 S-Class, and R230 SL was revolutionary — but it has a finite service life. Here is what every SBC-equipped Mercedes…
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diagnostics
Mercedes AC Blowing Warm Air: The Complete Diagnostic Guide to Finding & Fixing the Problem
When your Mercedes AC stops blowing cold, the problem is almost always one of five things. Here is how to tell which one it is without replacing parts on a…
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servicing
Mercedes Air Conditioning Regas: R134a vs R1234yf, Costs, and Why a Regas Without a Leak Test Is Wasted Money
Getting your Mercedes AC regassed without a leak test first is like filling a punctured tyre without fixing the puncture. Here is what a proper Mercedes AC service involves, why…
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faults
Mercedes OM642 EGR Cooler Failure: Coolant Loss, Diagnosis & Repair Costs
Unexplained coolant loss on an OM642 V6 diesel is frequently caused by a leaking EGR cooler — not a head gasket. Here is how to diagnose it correctly and what…
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faults
Mercedes M270/M274 Timing Chain: A-Class, GLA & C-Class Guide to Diagnosis and Repair
The M270/M274 turbo petrol engine shares its timing chain design with the M271 — and the same stretch problem. But the transverse layout in the A-Class and GLA makes the…
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servicing
Mercedes Service A vs Service B: What Each One Actually Includes & What You Should Pay
The most detailed plain-English guide to Mercedes Service A and Service B — what is actually included in each, typical London prices, how the Active Service System decides which you…
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diagnostics
Mercedes Diesel Emissions MOT Fail: What Actually Happened & How to Prevent It Next Time
The DVSA tightened diesel emissions testing in 2018, and Mercedes diesels — particularly those driven on short urban journeys — are failing more often than ever. Here is why and…
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