Mercedes packs more control units than many commercial aircraft: engine, gearbox, headlights, seats and even the tow-bar all talk on multiple CAN networks. When one module is replaced—or even updated by a routine service—the whole chain can break. That’s why we invested in a factory-licensed Xentry/Star Diagnosis setup, the very tool your dealer uses, backed by a 30 A Midtronics power supply to keep voltage rock-solid during coding and flashing. Whether you’ve fitted LED MULTIBEAM headlights to a W205 C-Class, replaced the 7G-Tronic conductor plate in an E-Class, or need a digital dash VIN-sync after mileage correction, we code it the OE way—at your doorstep or at our Roxburghe Avenue workshop.
Typical headaches that land on our laptop? A Sprinter 907 frozen in 20 mph limp mode after an AdBlue pump swap, a W213 E220d with a new turbo actuator that needs variant coding, an S-Class S500 whose replacement cluster flashes “——–” for mileage, or a C63 owner who added AMG calipers but the ABS unit still thinks the car wears 360 mm discs. Generic OBD readers can’t touch these issues; you need DAS or Xentry menus hidden behind factory seed keys, otherwise the new module sits mute on the CAN bus and the car sulks with a dash full of warning triangles.
Our diagnostic workflow mirrors the dealer—minus the invoice shock:
1. Full quick-test scan – Xentry interrogates every ECU and stores fault memory with freeze-frames.
2. Topology map & backup – we export an XML of the vehicle’s control-unit list before any changes, protecting your original coding.
3. Guided tests or manual coding – depending on your job, we follow Xentry’s guided functions or dive into developer mode for manual string edits.
4. Module flashing/SVN coding – files download direct from Daimler servers, flashed while the Midtronics SPS holds voltage at 13.8 V.
5. After-scan & live road test – we clear adaptation histories, run gearbox relearns and print an “all-green” report for your records.
Most-requested Mercedes services we perform daily:
• ECU & TCU software updates and SCN coding after replacement.
• 7G-Tronic & 9G-Tronic clutch adaptation reset following fluid service.
• Intelligent Light System / MULTIBEAM headlamp variant coding and height calibration.
• Digital dash (IC/NX) VIN write, mileage synchronisation and language change.
• SCR/AdBlue tank replacement bleed and NOx sensor learning.
• Airmatic ride-height calibration and tight-tolerance mode for wheel alignment.
• DPF ash counter reset and forced regeneration on OM651/OM654 engines.
• Key programming & ESL/ELV unlock for W204/W207 steering lock failures.
For mobile visits we roll out an 8 m extension with 230 V inverter to power Xentry and the PSU, erect a rain canopy if needed, and earth-strap the chassis before module flashing. Workshop jobs get a pre-booked two-hour slot with Wi-Fi and fresh coffee—ideal if you’re waiting while we program. A 15-mile validation loop up Hanchurch Hill and back down the A34 logs gearbox slip, EGT, DEF pressure and boost targets to confirm every adaptation took hold. We email a PDF of the “before” and “after” quick-test so fleet managers and warranty companies see proof of the fix.
Why Mercedes owners choose Stoke Tuning over the dealer
• Genuine Xentry & Star tools—no cloned C4 knock-offs.
• Evening and weekend mobile slots to keep taxis, ambulances and vans earning.
• Fixed pricing per job: cluster coding £120, 7G adaptation reset £110, headlight variant coding £90 (parts extra).
• Live support line for 30 days—if a module drifts, we re-adapt free of charge.
• IMI-accredited technician with £2 m public-liability cover and 10+ years Mercedes electrical experience.
Need a 9G-Tronic software update, a new headlight coded or an SCR countdown cleared? Call 07503 078486, email stoketuning@gmail.com or message us on WhatsApp. We’ll bring the dealer diagnostics to you—or have the kettle ready in the workshop—so your star stays shining.