Diagnostics

Dealer-level
fault diagnosis.

Manufacturer-grade diagnostic equipment and decades of marque-specific experience — finding what others cannot, explaining it in language you can act on.

Typically 1–2 hours; complex intermittents may require longer
Overview

Engineered with intent.

Modern vehicles are software defined. A misdiagnosed fault becomes weeks of replaced parts, mounting bills and unresolved warning lights. We start by reading the vehicle the way the manufacturer intended — using the same equipment they certify their dealers on.

From intermittent electrical gremlins to complex hybrid drivetrain faults, every investigation is logged, photographed and shared with you in real time through LiveTrack™. You see what we see, when we see it.

What's covered

The specifics, explained.

01
Warning Lights

Read, interpreted and quoted before any work.

02
Engine Management

Live data, fuel trims, sensor performance.

03
ABS & Airbag

Module diagnosis, replacement and coding.

04
DPF & AdBlue

Forced regen, decontamination, SCR repair.

05
Electrical Faults

Parasitic draw, CAN/LIN, body control.

06
ADAS Diagnostics

Camera and radar calibration to OEM spec.

What's Included

Every detail, documented.

Warning light and engine management fault finding

ABS, ESP and traction control diagnostics

Airbag (SRS) module diagnosis and reset

DPF regeneration and forced clean

AdBlue / SCR system diagnostics

Electrical and battery system testing

ADAS calibration and recoding

Manufacturer-level diagnostics (PIWIS, XENTRY, ISTA, ODIS, SDD)

Typical Time

Typically 1–2 hours; complex intermittents may require longer

Collection and a courtesy vehicle available across Bristol on request — your day, uninterrupted.

Benefits

Outcomes you'll notice.

  • Diagnose first, replace second — no guesswork
  • Single hourly diagnostic fee, rebated against any repair
  • Photographed live data and screen captures on LiveTrack™
  • Quotation issued before any remedial work begins
Why LONS Fleet Management Ltd

The difference is measurable.

01
Master Technicians

Marque-experienced engineers, continually re-certified.

02
Dealer-Level Equipment

OEM diagnostic and calibration tooling on every bench.

03
Transparent Pricing

Itemised quotations approved before any work begins.

04
Warranty Protected

Servicing that preserves your manufacturer warranty.

LiveTrack™ Integration

Watch every stage in real time.

Every customer receives a private LiveTrack™ link with live updates, technician photos, walk-around videos, digital reports, online estimate approvals and end-to-end progress tracking — from check-in to handover.

  • Live progress updates
  • Technician photographs
  • Walk-around videos
  • Digital inspection reports
  • Online estimate approvals
  • End-to-end progress tracking
Live
Current stage
Inspection complete
67%Bay 03 · James Walker
Before & After

The result, unretouched.

Diagnostics before
Before
Diagnostics after
After
Standards

Trusted by Bristol drivers.

DVSA Authorised

MOT Class 4 & 7 testing on-site

Fully Insured Workshop

Public liability & motor trade cover

Manufacturer-Equivalent Servicing

Service book stamps preserve your warranty

FAQ

Questions, answered.

If it is amber, drive carefully and book in promptly. If it is red (oil pressure, coolant, brake), stop safely and call us on 0117 427 3457 — recovery can be arranged across Bristol.

Yes. We operate factory-grade platforms including Porsche PIWIS, Mercedes XENTRY, BMW ISTA, Audi ODIS, Land Rover SDD plus advanced Snap-on and Autel multi-marque tools.

Yes — we diagnose and reset all driver-assistance, ABS, SRS, DPF, AdBlue and EV high-voltage systems, with calibrated ADAS recalibration available.

Our standard diagnostic hour is a flat fee that we always quote up front. If repair work is required, that fee is rebated against the repair.

Every booking includes LiveTrack™ as standard. You receive a private link to view photographs, videos, technician notes and approve estimates from any device.

We collect across Bristol and the surrounding BS postcodes and return your vehicle on completion. Account holders also receive priority scheduling.

Yes. Your digital service record is updated on completion and synchronised with the manufacturer's online portal where supported.

Serving Bristol

Bristol drivers from Clifton to Kingswood rely on us for diagnostic work the local dealerships either won't take on or quote at inflated rates.

Unit 1A, Barton Hill Trading Estate · Bristol · BS5 9RD

Ready to book your vehicle?

Reserve your appointment.

Book online in under two minutes, call our workshop directly, or email — whichever suits you best.