ESP AUDI A4 1998 B5 / 1.G APB Engine Oxygen Sensor Control Checking Workshop Manual

24-101

Notes:

Oxygen sensor control behind the catalytic
converter is responsible for final control
correction. It is the primary sensor and can
override the signal from the oxygen sensor
control before the catalytic converter..

Component location of harness connectors Page 24
-5
It corrects slight changes in the mixture (i.e. enrichment) via the
oxygen sensor before catalytic converter by holding the oxygen
sensor control before catalytic converter at its higher or lower limit for
a specific time (duration). If this time is in the positive range (i.e. 50
ms), mixture is shifted in the -enrich- direction. If this time is in the
negative range (i.e. -50 ms), mixture is shifted in the -lean- direction.
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