Additional lambda comparison
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In borderline cases, where e.g. one SAS-side is partly blocked and the flow loss is compensated by a high tolerance system, the air flow checks may not detect hundred per cent accurately. Therefore an additional lambda comparison is used which works similar to the bank allocation described above. If one bank is detected much richer than the other, it is detected as faulty. The decision for leak or plugging is reached by the comparison of SAF and model, whereas "model higher than flow" means plugging and vice versa.