Test point 7 Oxygen regulation stop

Fault code 123

Test 1 : Check CO level with running engine and connected CO tester (between 0.4 - 1.2 %)

too lean: Check intake system for leaks (Test point 21)

too rich: Test system pressure (test point 20)

Test injection valves for leaks (test point 20)

The oxygen regulator cannot operate in its control range owing to problems with mixture preparation, e.g. too lean because of additional air or too rich because of a sticking injection valve. The oxygen regulator then moves up to the stop position.

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