Mercedes-Benz vehicles are known for their luxury, performance, and engineering excellence. But like any high-spec car, they’re not immune to the occasional fault. At MB Wirral, we see a wide range of common issues across different Mercedes models — and because we specialise exclusively in Mercedes-Benz, we know how to diagnose and repair them quickly and correctly.
Below, we break down some of the most frequent problems we see in our workshop — and how our team of trained Mercedes technicians resolve them using dealer-grade diagnostics and expertise.
1. Gearbox Problems in the Mercedes E-Class
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One of the most reported faults in the E-Class, particularly in older models, involves the 7G-Tronic automatic gearbox. Symptoms can include rough shifting, hesitation when accelerating, or warning lights appearing on the dash.
How we fix it:
We use STAR diagnostic software to read fault codes and identify transmission issues. Common repairs include valve body replacements, software updates, or in some cases, a full gearbox service. In more serious cases, we can source and fit reconditioned gearboxes to manufacturer standards.
2. Timing Chain Rattles (Common in C-Class and A-Class)
If you hear a rattling noise from the engine, especially on cold starts, it may indicate a stretched timing chain — a known issue in some petrol Mercedes engines.
How we fix it:
We carry out a thorough inspection using dealer-level tools. If timing chain replacement is needed, we only use OEM or Mercedes-approved parts to ensure long-term reliability.
3. AdBlue and SCR System Issues in Diesel Models
Newer diesel Mercedes models use AdBlue to reduce emissions. However, many owners report issues with sensors, crystallisation in the injector lines, or dashboard warnings like “AdBlue malfunction – no engine restart in X miles.”
How we fix it:
We diagnose the system with specialist tools and inspect the injector, NOx sensors, and pump. Whether it’s a sensor fault or an injector cleaning job, we’ll sort it before it leads to costly breakdowns.
4. Suspension Faults in the S-Class and ML/GLE SUVs
Mercedes’ AIRMATIC suspension provides incredible ride comfort, but components like air struts and compressors can fail with age, causing uneven ride height or a sagging rear end.
How we fix it:
We check the full air suspension system, including leak detection and pressure tests. Our workshop can replace faulty air struts or compressors and reprogramme the system to restore perfect balance and performance.
5. Electrical Gremlins & Warning Lights
Mercedes vehicles are packed with electronics — which, while advanced, can sometimes become problematic. Common issues include faulty parking sensors, malfunctioning COMAND infotainment, or random dashboard warning lights.
How we fix it:
We run full diagnostics to isolate faults, reprogramme ECUs if needed, and repair wiring or replace modules using official Mercedes procedures. No guesswork, no unnecessary parts-swapping.
Why Choose MB Wirral?
As an independent Mercedes-Benz specialist based in the Wirral, we offer dealership-level service at competitive prices. From E-Class gearbox problems to AIRMATIC suspension repairs, we’ve seen it all — and we’ve fixed it all.
With genuine STAR diagnostics, Mercedes-trained technicians, and a commitment to transparent, honest service, MB Wirral is your go-to garage for everything Mercedes.
Book Your Diagnostic Check Today
Noticed a strange noise, warning light, or performance dip? Don’t wait for it to get worse. Contact MB Wirral today for expert diagnosis and repair, with service tailored specifically to your Mercedes.
