Manufacturer-specific code

This code means different things on different makes. Find yours below.

• Volkswagen, Audi, Seat, Skoda, Cupra

  Long-term fuel trim (multiplicative) bank 1: system too lean

  Bank 1 mixture adaptation has reached its lean correction limit in the part-load (multiplicative) range. The engine computer is adding fuel; possible reasons include incorrect air measurement, insufficient fuel delivery or a misleading lambda signal.

  Likely causes, most likely first

  1. 01Mass air flow (MAF) sensor reading low (dirty or aged)
  2. 02Air leak between the MAF sensor and the throttle (split intake boot)
  3. 03Low fuel pressure: clogged fuel filter or weak fuel pump
  4. 04Exhaust leak before the front lambda sensor
  5. 05Front lambda sensor aged or contaminated
  6. 06Poorly calibrated LPG conversion (if fitted)

  Severity: Caution: get it checked soon · DIY with tools and some experience