Guides GetCarCode

• Check engine light: can I drive, and what should I check?

  A quick decision guide for a steady or flashing engine light, with safe checks and the information to take to a garage.

• How to read OBD2 codes without buying the wrong part

  Connect a scanner, save the results and understand pending, confirmed and manufacturer-specific codes.

• P0420: what to test before replacing the catalytic converter

  A practical diagnosis order for catalyst-efficiency faults, avoiding unnecessary sensor or converter replacement.

• Red oil warning light: stop the engine, then check safely

  Distinguish oil-pressure warnings from level or service reminders and avoid engine damage.

• Car shaking at idle: what to record and what to check

  Separate rough engine running from vibration caused by mounts, and know when to stop.

• Toyota Corolla: practical checks for fault codes and buying used

  A symptom-led checklist for Toyota Corolla; confirm the year, engine and gearbox before applying any advice.

• Mazda 3: practical checks for fault codes and buying used

  A symptom-led checklist for Mazda 3; confirm the year, engine and gearbox before applying any advice.

• Skoda Octavia: practical checks for fault codes and buying used

  A symptom-led checklist for Skoda Octavia; confirm the year, engine and gearbox before applying any advice.

• Kia Sportage: practical checks for fault codes and buying used

  A symptom-led checklist for Kia Sportage; confirm the year, engine and gearbox before applying any advice.

• United Kingdom

  MOT in Great Britain: expiry, preparation and what a failure means

  Check your MOT on GOV.UK, prepare safely and understand major, dangerous and advisory results.

• United Kingdom

  Buying a used car in the UK: MOT history and viewing checklist

  Compare official MOT mileage and vehicle records, then check what a free lookup cannot show.

• DPF warning light: is a regeneration drive safe?

  Check the handbook, oil level and other warnings before trying to clear a diesel particulate-filter warning.

• Car will not start: battery checks before buying a replacement

  Separate a no-crank fault from an engine that cranks but will not start, with safe next steps.

• P0171: how to diagnose a lean mixture without guessing

  Check symptoms, intake leaks and fuel-trim evidence before ordering a MAF sensor or fuel pump.