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Special tools and workshop equipment required > < Checking voltage supply for lambda probe heating

A3 Mk1

Checking lambda probe and lambda control downstream of catalytic converter
Checking lambda probe and lambda control downstream of catalytic converter
  Note!
t  The lambda control downstream of the catalytic converter is superior to the lambda control upstream of the catalytic converter and is used as correction control.
t  The lambda probe downstream of catalytic converter corrects slight mixture changes (e.g. enriches), by maintaining the lambda control upstream of the catalytic converter for a certain period (dwell time) at the upper / lower point.
   

Special tools and workshop equipment required > < Checking voltage supply for lambda probe heating