Diagnostics
Standard Diagnosis
From £120 · Mercedes cars & vans · All faults
Dashboard lit up? Engine light, limp mode, AdBlue warning, or something that just doesn't feel right? Standard Diagnosis is our core service - a thorough on-site visit with Mercedes dealer-level tooling, at your location. We identify the root cause and give you a clear written fix plan. No guesswork, no “we'll have a look and see”.
How It Works
Get in touch
Tell us your postcode, vehicle, and symptoms. We confirm your zone and fixed price.
Confirm your slot
Pick a date and time that works for you. We arrive at your location with full diagnostic kit.
On-site diagnosis
Deep scan across all modules, live data checks, guided tests, sensor plausibility, and actuations.
Written fix plan
You get a clear outcome: fault codes, root cause, and recommended next steps. Plain English, no jargon.
What We Diagnose
Standard Diagnosis covers all of these - one service, one price, no need to pick a specialist sub-type.
Warning Lights & Fault Codes
Engine management light, ABS, ESP, glow plug, battery, and any other dashboard warning. We scan every module - not just the engine - to find the root cause, not just clear codes.
Emissions, AdBlue & DPF
AdBlue countdown, SCR/NOx sensor faults, DPF soot load and regen issues, EGR problems, and dosing unit failures. Live data testing, not just fault code reads - we identify whether you need a sensor, a regen, or a deeper repair.
Limp Mode & Derate
Turbo boost faults, fuel rail pressure issues, injector drift, EGR valve failures, and wiring faults that cause derate. Systematic testing to isolate the root cause - especially on Sprinters (W906/W907/W910).
Electrical & Wiring Faults
Intermittent faults, parasitic battery drain, CAN network communication issues, connector corrosion, and random warning lights. We use oscilloscope and live data capture to replicate and trace faults.
Mercedes Xentry & OEM Coding
Dealer-level Xentry access for SCN coding, variant coding, module adaptations, DAS guided tests, and initialisation. Used as part of Standard Diagnosis when OEM-level access is required.
What's Included
- Full-system scan (all modules, not just engine)
- Freeze frame and fault code analysis
- Live data checks and sensor plausibility
- Guided tests and actuations where applicable
- Mercedes Xentry dealer-level access when needed
- Written findings and root cause analysis
- Recommended next steps and quote for follow-on work
- Up to 60 minutes on-site time
What Your Written Outcome Looks Like
Every Standard Diagnosis ends with a documented written outcome. Below is a glimpse from one real visit. See the full walkthrough for how plain English, ruled-out causes, live data, and next steps fit together.
Pricing
| Zone | Drive time | Price |
|---|---|---|
| Zone A | 0-25 mins | £120 |
| Zone B | 25-45 mins | £135 |
| Zone C | 45-60 mins | £150 |
Includes travel and up to 60 mins on-site. Deposit £30 (Zone A/B) or £50 (Zone C). If additional diagnostic time is needed, it's billed at £85/hour in 15-minute blocks.
Examples From Our Work
Real photos from real diagnostic visits
Fleet & Commercial Customers
We work with fleet operators, hire companies, and depot managers across Kent and South East London. If you have multiple vehicles needing diagnostic attention, we can arrange bulk visits with priority scheduling. Common fleet scenarios include proactive health checks, fault sweeps, and DPF/AdBlue status reviews across your fleet.
When Workshop Referral May Be Needed
- Work requiring ramp or major underbody access
- Heavy drivetrain jobs that can't be done safely mobile
- Faults requiring manufacturer-specific online access (documented for referral)
Frequently Asked Questions
We'll tell you honestly. If a fault is intermittent or needs specialist equipment we don't carry mobile, we'll document what we've checked and refer you to an appropriate workshop with our findings. You still get a written outcome - no dead ends.
Ideally yes - we like to discuss symptoms with you and may need the keys for guided tests. If you can't be there, we can work with someone you authorise (e.g. at a depot). Just let us know when booking.
We'll quote you for the parts and labour before any work begins. We use genuine Mercedes parts. Follow-on labour after the included 60 minutes is £85/hour in 15-minute increments.
The diagnostic visit is up to 60 minutes on-site. If we need additional time to investigate a complex fault, we'll discuss it with you first. Extra diagnostic time is billed at £85/hour in 15-minute blocks.
Yes. Standard Diagnosis covers Mercedes cars and vans, plus other makes. Our specialist focus is Mercedes commercial vehicles, but the diagnostic process and tooling works across the range.
Standard Diagnosis is our core service for any vehicle with a fault or warning light - 24-hour notice, thorough investigation, written fix plan. VOR Diagnosis is for commercial vehicles that are off the road and need a fast back-on-road decision, with zero minimum notice and priority dispatch.
Yes - emissions, AdBlue, DPF, SCR, NOx, and EGR faults are all covered under Standard Diagnosis. We test with live data, not just fault code reads, so you get a proper root cause and clear next steps.
Absolutely. We work with fleet operators, hire companies, and depot managers regularly. If you have multiple vehicles, we can arrange bulk diagnostic visits. Get in touch via WhatsApp or call to discuss.
Need a proper diagnosis?
Book a Standard Diagnosis and get a clear answer - at your door.