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 rich

  Bank 1 idle (additive) mixture adaptation has reached its rich correction limit. The engine computer is reducing fuel because the lambda feedback indicates a rich mixture.

  Likely causes, most likely first

  1. 01Leaking injector or excessive fuel pressure
  2. 02EVAP purge valve (N80) admitting excessive fuel vapour
  3. 03Incorrect MAF or front lambda sensor readings
  4. 04Fuel-contaminated oil supplying excessive vapour through crankcase ventilation

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