Tell us the car and what it is doing. CarFaultIQ asks targeted questions, narrows the likely causes as you answer, and tells you what to check next.
We reason in depth about how the engine runs, overheating and coolant, and brakes — those get a full guided diagnosis. Other recognised problems get structured troubleshooting guidance instead, and we always tell you which of the two you are getting.
Which car?
Vehicle coverage
Find your car
The same make, model and year lookup used across CarFaultIQ.
You can skip this. The reasoning is the same for most cars — telling us lets us flag anything on record for your exact model year.
What is it doing?
We match your words against our symptom list and show you what we found. Nothing is used until you confirm it, and we do not store what you typed.
Engine and how it drivesHow the engine runs, pulls and idles
Starting and stallingTurning the key, cranking, cutting out
Overheating and coolantTemperature gauge, coolant loss, the heater
BrakesNoises, pedal feel, stopping and pulling
Windscreen, heating and air conMisting, demisting, airflow and cooling
Battery, charging and electricsFlat batteries, dim lights, warning lights
Gearbox and drivetrainShifting, slipping, driveline noises
Steering, suspension and tyresHeavy steering, vibration, pulling, wear
Smells, smoke and leaksAnything you can smell, see or find underneath
Noises I cannot placeStart here if you are not sure where the noise comes from
Cannot see it? Describe it in your own words on the first tab — we understand a lot more wording than this list shows.
Add as many as you have. More than one code often points at a single underlying cause rather than several separate faults.
Ready to check
Nothing selected yet. Describe the problem, pick from the list, or add a fault code above.
Nothing is diagnosed until you press this. You can add more, or change your answers, once it has started.
Safety guidance here is written by our editorial team and is awaiting sign-off by a named automotive reviewer (0 of 44 rules signed off). For brakes, steering or a suspected leak, treat a professional inspection as the safe answer.