The size of the PR 138 parameter which is read out on the diagnostic unit "VALUE of CORRECTION of COMPOSITION of WORKING MIX" represents the average size brought by EBU depending on information on composition of the working mix transferred by the oxygen sensor installed before catalytic converter (the oxygen sensor analyzes the content of oxygen in the fulfilled gases).

Value of correction for an average point of 50% and for extreme provisions 0 and 100 of %:

– value below of 50% request for mix impoverishment;

– value above of 50% request for mix enrichment.