Installation position of the lambda sensor

As a basic rule: In order for the catalytic converter to work optimally, the air-fuel ratio in the combustion chamber must be precisely attuned. In the process, lambda sensors play an important role.

Modern vehicles have at least two lambda sensors. A control sensor is positioned before the catalytic converter and - since the introduction of On-Board-Diagnostics (OBD) - a diagnostic sensor is positioned after the catalytic converter.

Modern vehicles have at least two lambda sensors. A control sensor installed in front of the catalytic converter and a rear or diagnostic sensor mounted after the catalytic converter.
Modern vehicles have at least two lambda sensors. A control sensor installed in front of the catalytic converter and a rear or diagnostic sensor mounted after the catalytic converter.

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