Diagnostics | Sompting, West Sussex
Mercedes Fault Finding
Warning light on, an 'Auxiliary battery malfunction' message, or something on your Mercedes that has stopped working as it should? Our Mercedes fault finding specialists at Cedar Garage German Car Specialists in Sompting, just outside Worthing, use Mercedes-specific diagnostic equipment and manufacturer data to find the real cause, then explain it clearly and give you a quote before any repair work starts. We look after Mercedes drivers from Worthing, Shoreham, Lancing and across West Sussex.
Dealer-Level Equipment
Why Choose Cedar Garage for Mercedes Fault Finding?
Our motto is simple: test, don't guess. A fault code tells us which system has spotted a problem, not always what caused it, so accurate Mercedes fault finding means checking live data and testing the sensors, wiring and components involved before any part is replaced. Our Mercedes-trained technicians work on the full range every day, from the A-Class, C-Class and E-Class to the S-Class, GLA, GLC and GLE.
You get the same level of diagnostic equipment as the main dealer, including Mercedes' own XENTRY diagnostic software, with the personal service of an independent garage. We can collect your Mercedes and return it when the work is done, or provide a hire car while it's with us, and we'll never spend more of your money without your approval.
Mercedes Warning Lights and Faults We Investigate
From an engine management light or limp mode to an AdBlue countdown or a heater blower that only works on full speed, our Mercedes fault finding covers every system on your car. These are some of the most common Mercedes warning lights and faults we're asked to track down.
Brake & ESP warnings
Battery, heater & electrical faults
Engine, AdBlue & DPF faults
Tyre pressure warnings
Steering, suspension & gearbox
Other Mercedes Services We Specialise In
Once we've found the fault, we can put it right and keep your Mercedes running at its best with our other specialist Mercedes services.
DVSA-Approved Testing
Mercedes MOT
An engine, ABS or airbag warning light can mean an MOT failure. Our DVSA-approved testers carry out Mercedes MOTs every week, and if a fault shows up we can find and fix it in the same visit.
Manufacturer Schedule
Mercedes Servicing
Many faults can be prevented with the right maintenance. We carry out Mercedes Service A and Service B to the manufacturer's schedule using the correct MB-Approval oil, and update your service history.
Dealer-Level Fixes
Mercedes Repairs
When our fault finding pinpoints the problem, our technicians repair it to main dealer standard, from intake leaks and DPF faults to blower regulators, batteries and complex electrical faults.
Ready to book your Mercedes fault finding?
Book online or call our German Car Specialists on 01903 830303 and we'll get to the bottom of it.
Collection & Delivery
We can collect your Mercedes from home or work and bring it back once the fault has been found and fixed.
Hire Cars Available
Need to stay on the road? Ask about a hire car while we find and fix the fault on your Mercedes.
Wait in Comfort
Relax in our waiting area with free Wi-Fi and a hot drink while we carry out initial fault finding checks.
Frequently Asked Questions
Mercedes Fault Finding FAQs
What does a Mercedes diagnostic check involve?
We use Mercedes' own diagnostic software to read any fault codes, then test the parts involved to find the real cause. We'll explain what's wrong and give you a quote before any work goes ahead.
How much does Mercedes fault finding cost?
We start with an initial fault finding check at a fixed price, which we'll confirm when you book. If the fault needs more time to track down, we'll always ask you first.
Why is the engine management light on in my Mercedes?
There are lots of possible causes, from a simple sensor fault to something more serious. A steady light means book in soon, while a flashing light means stop driving and give us a call.
Why has my Mercedes gone into limp mode?
Limp mode is your Mercedes protecting itself after spotting a fault, so it limits power. Book in for fault finding and we'll find exactly what's needed before any work goes ahead.
What does the AdBlue warning mean on my Mercedes?
It may just need topping up. If the warning stays on, or you see a countdown before the engine won't restart, there's a fault, so book in as soon as it appears and we'll find the cause.
Why are the ESP and ABS lights on in my Mercedes?
It's often caused by a faulty sensor. Your brakes will still work, but it's worth booking in for fault finding soon, especially as an ABS light is an MOT fail.
What does 'Auxiliary battery malfunction' mean on my Mercedes?
Many Mercedes have a small second battery, and this warning usually means it's getting weak. Book in and we'll test it and replace it if needed.
Why does my Mercedes heater blower only work on the highest setting?
This is a common Mercedes fault, usually caused by a faulty part that controls the fan speed. Book in for fault finding and we'll find out exactly what's failed.
Why is the glow plug light on in my Mercedes?
On a Mercedes diesel, this light usually means there's a fault with the glow plugs, which help the engine start from cold. Book in for fault finding and we'll find exactly what has failed.
Will using an independent garage affect my Mercedes warranty?
No. You can have your Mercedes serviced and repaired by an independent garage without affecting its warranty, as long as the right parts and procedures are used, which is exactly how we work.
Do I need the main dealer for software updates or programming?
No. We use Mercedes' XENTRY software for updates, programming and coding, so your Mercedes can be diagnosed, fixed and programmed in one place.
