Your warning light is telling you something. We find out exactly what.

Modern vehicles have dozens of interconnected electronic systems. When a fault develops, a basic code reader tells you a fault code — not the cause. Mechapro carries out structured diagnostic investigation to find the confirmed root cause before recommending a single part.

Our Diagnostic Process

How we diagnose — step by step

Unlike a basic code read, a Mechapro diagnostic session may include all of the following, depending on the fault:

✅ Full system module scanning across all vehicle networks

✅ Live data monitoring — comparing sensor readings against manufacturer parameters

✅ Guided component testing — verifying individual components under load

✅ Actuator and output testing — confirming control modules are commanding correctly

✅ Voltage drop and wiring integrity checks

✅ CAN network communication testing — identifying bus faults and dropout conditions

✅ Sensor performance verification

✅ Structured elimination procedures to isolate the fault

Most code readers cannot carry out 90% of the above. Parts are only recommended once the fault is confirmed. Not before.

Common Faults We Diagnose

Faults we regularly identify and resolve

• Engine management lights (EML) — including causes that code readers miss

• DPF and EGR related faults

• Misfires and poor engine performance

• Crank / no-start conditions

• Electrical faults and unexplained battery drain

• ABS and traction control warning lights

• Airbag and SRS system faults

• Turbo and boost pressure issues

• Cooling system control faults

• CAN network and communication errors

• Intermittent faults — including those that only occur under specific conditions

• 48V mild hybrid system faults (starter-generator, auxiliary battery)

What You Receive After a Diagnostic

After every diagnostic session

Persistent warning light? Unexplained fault?

Send your vehicle registration and a description of the fault via WhatsApp. We will advise on the appropriate diagnostic approach and confirm availability across Luton, Milton Keynes, Bedford, Watford and surrounding areas.

✅ Clear explanation of what was found — in plain language, not jargon

✅ Confirmation of the root cause where identified

✅ Professional repair recommendation if required

✅ No pressure. No unnecessary parts. No speculation

✅ Transparent written quotation before any work proceeds

Car Diagnostics & Fault Finding

Professional mobile diagnostics at your location

From £50

45-minute diagnostic session