Car Diagnostics Hub
Start with symptoms such as overheating, vibration, no-start faults, smoke, smells and power loss.
Open diagnostics →
UK Automotive Diagnostics Platform
Find Out What’s Wrong With Your Car
Check warning lights, engine problems, MOT risks and repair costs in plain English before spending money on repairs.
✓ UK-focused
✓ MOT-aware
✓ Symptom-based
✓ Repair cost guidance
Start here
Describe Your Car Problem
Choose the closest symptom or warning light to start finding possible causes and next steps.
Engine light flashing, car shaking, overheating, clicking noise, won’t start...
Main hubs
Choose where to start
Use the main hubs to find warning light meanings, diagnostic help, repair cost advice and MOT guidance quickly.
Dashboard Warning Lights
Understand red, amber and flashing warning lights, safe-to-drive guidance and MOT relevance.
Open warning lights →UK Repair Cost Guides
Check likely repair areas and cost guidance before agreeing to garage work.
View repair costs →MOT Failure Guides
Check common MOT failures, legal questions, retest rules and warning light risks.
Open MOT hub →Cooling System Guides
Coolant leaks, overheating, radiator fan faults, thermostats, water pumps, white smoke and cooling system diagnosis.
Open cooling hub →Used Car Buying Guides
Inspection checklists, MOT history checks, service history, scams, mileage advice and first car buying guides.
Open used car hub →
Warning lights
View all warning lights →
Dashboard Warning Lights Explained
Understand what your warning light means, whether it may be safe to drive, and what to check next.
Engine Management Light
Common causes, limp mode, misfires, emissions faults and repair urgency.
Diagnose light →Battery Warning Light
Alternator faults, battery charging issues, belts and electrical problems.
Check battery light →Oil Warning Light
Oil pressure problems, engine risk and what to do when the oil light appears.
Read guide →ABS Warning Light
ABS faults, braking safety and whether the ABS light can affect MOT results.
Check ABS light →Coolant Warning Light
Coolant leaks, overheating, radiator problems and safe stopping advice.
Read guide →DPF Warning Light
Blocked DPF symptoms, regeneration issues and diesel driving advice.
Check DPF light →Airbag Warning Light
Airbag faults, seatbelt systems, crash sensors and MOT failure risk.
Read guide →Brake Warning Light
Brake fluid, handbrake faults, worn pads and urgent brake safety checks.
Check brake light →
Symptom diagnostics
View all diagnostics →
What Is Your Car Doing?
Start with the symptom you notice. Each path helps you understand likely causes, urgency and next checks.
High urgency
Car Won’t Start
Battery, starter motor, immobiliser, fuel delivery and crank/no-start checks.
Start diagnosis →
Stop safely
Car Overheating
Coolant leaks, thermostat faults, radiator blockage, fan issues and water pump failure.
Check causes →
Inspect soon
Shaking Or Vibrating
Tyres, wheel balancing, brakes, suspension, steering faults and wheel bearings.
Diagnose vibration →
Power issue
Losing Power
Turbo faults, DPF issues, limp mode, misfires, fuel problems and clutch slip.
Check power loss →
Smell clue
Strange Smells
Burning rubber, oil, coolant, exhaust fumes, petrol smells and hot engine smells.
Identify smell →
Driveability
Jerking Or Juddering
Acceleration jerks, low-speed juddering, gear change problems and fuel delivery issues.
Diagnose jerking →
Repair costs
View repair cost hub →
Average UK Repair Cost Guides
Understand common repair areas before agreeing to expensive work.
Clutch Replacement Cost
Clutch kit, flywheel, labour time and common clutch symptoms explained.
View cost guide →Brake Pad Replacement Cost
Brake pad prices, warning signs, labour and brake disc considerations.
View cost guide →Starter Motor Cost
Clicking, no-start issues, labour time and starter replacement advice.
View cost guide →Alternator Replacement Cost
Charging faults, battery light issues and alternator replacement costs.
View cost guide →Wheel Bearing Cost
Humming noises, speed-related bearing noise and replacement costs.
View cost guide →Coolant Leak Repair Cost
Leaks, overheating, water pumps, radiators and hose repair areas.
View cost guide →MOT Failures & Legal Questions
Check common MOT failure areas, advisories, legal questions and safety-related faults before your test.
Before You Drive, Tax Or Buy
Start diagnosis
Understand the fault before spending money
Use Motor Vehicle Expert to check symptoms, warning lights, MOT risks and likely repair areas before booking work.