Advanced diagnostics
Deep fault finding, full module scans, live data and difficult intermittent faults.
Mobile • Chigwell • London • Essex
S JAY
Auto Electrical & Diagnostics
What others can't fix, we fix.
Advanced vehicle diagnostics, electrical fault finding, ECU coding and programming. From CAN network faults to non-start and no-READY problems — we come to you.
⚙ Qualified auto electrician★ 15 years' experience⚡ EV & hybrid🚘 All makes & models
⚡ ADVANCED CAN / LIN NETWORK TESTING ◆ EV & HYBRID DIAGNOSTICS ◆ ECU CODING & PROGRAMMING ◆ GHOST IMMOBILISER ENQUIRIES ◆ MOBILE LONDON • ESSEX • CHIGWELL ◆
◆ Dealer-level diagnostics◆ CAN / network fault finding◆ ECU coding & programming◆ Mobile at your location
Precision over guesswork
Our services
Electrical, software and vehicle-network diagnostics for modern cars. From tracing a single damaged wire to diagnosing complex communication faults.
CAN bus & network faults
CAN / LIN communications, gateway faults, missing modules, power and ground testing.
ECU coding & programming
Module replacement coding, adaptations, software configuration and programming.
Wiring repairs
Harness tracing, open circuits, short circuits, connector and voltage-drop testing.
Non-start / no-READY
Petrol, diesel, hybrid and electric vehicle starting and readiness faults.
Keys & immobilisers
Key programming, immobiliser diagnosis, module alignment and lost-key enquiries.
Module repairs
ECU / BCM diagnosis, module repair assessment, cloning and virginising enquiries.
Infotainment upgrades
CarPlay, Android Auto, cameras, screen retrofits and feature activation.
EV & hybrid diagnostics
12V systems, high-voltage interlock and hybrid electrical fault diagnosis.
ADAS systems
Radar and camera fault diagnosis, coding and calibration enquiries.
Crash / SRS systems
Airbag fault diagnosis, crash-event assessment and post-collision no-start faults.
Retrofits & upgrades
OEM-style feature upgrades, lighting, modules, coding and custom installations.
Protection for modern vehicles
Vehicle security & immobilisers
Help protect your vehicle with security-system installation enquiries, keyless theft protection and specialist immobiliser services.
Ask about security fitting →Ghost immobiliser installation
- Ghost immobiliser installation enquiries
- Keyless entry vehicle protection
- New and late-model vehicles
- Key programming and immobiliser systems
- Vehicle-specific suitability checks
Installation and compatibility subject to vehicle and equipment requirements. No manufacturer affiliation implied.
Actual diagnostic work
We find what others miss
Examples of the diagnostic approach behind the S JAY name.
MG — unexplained non-start
After software and programming checks elsewhere, a crash event in a restraint module was identified as the cause of the vehicle lockout.
MG ZS EV — no READY mode
Multiple warning lights and offline modules traced to a 12V auxiliary battery voltage drop affecting network communication.
VW Golf GTE — headlamp faults
Post-repair lighting issues traced to incorrect-spec replacement headlights and missing LED control modules, rather than coding.
Nissan X-Trail e-Power — SRS fault
After other parts had been replaced, diagnosis identified a pinched wire behind a bulkhead connector.
The process
No guesswork. Real testing.
01
Full system scan
Read faults across relevant modules, not just the engine ECU.
02
Analyse the data
Compare live readings and check module communication.
03
Test the circuits
Check wiring, connectors, power supplies and grounds.
04
Identify the cause
Explain the fault and recommend the correct repair route.
Mobile service • London • Essex • Chigwell
Ready to get it fixed?
Tell us the vehicle registration, model, symptoms and your location.
07865 333 996