- 1056BA Check injector efficiency
- 1056BB Check efficiency of hot film air flow meter
- 1056BC Check intake air temperature sensor operation
- 1056BD Check on operation of throttle casing throttle position switch
- 1056BE Check efficiency of hot film air flow meter
- 1056BF Check efficiency of hot film air flow meter
- 1056BG Check on operation of engine coolant temperature sensor
- 1056BH Check altitude corrector efficiency
- 1056BI Check fuel consumption
- 1056BX MAP/flow meter signal plausibility