Manufacturer-specific code

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

• Volkswagen, Audi, Seat, Skoda, Cupra

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

  Bank 1 mixture adaptation has reached its lean correction limit in the idle (additive) range. Unmetered intake air is a common cause, but fuel delivery and sensor faults can also produce this code.

  Likely causes, most likely first

  1. 01Leaking crankcase ventilation valve, diaphragm or breather hoses
  2. 02Intake manifold or vacuum hose leak, including the brake servo hose
  3. 03EVAP purge valve (N80) leaking when commanded closed
  4. 04Low fuel pressure or restricted injectors
  5. 05Incorrect MAF or front lambda sensor readings

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