The air/fuel ratio sensor (AFS) circuit can be measured directly with a digital multimeter with accuracy.

Question

Quizplus · Accepted Answer

The air/fuel ratio sensor (AFS) generates a voltage or current signal that varies with the oxygen content in the exhaust, and it operates at a higher temperature than traditional oxygen sensors. Directly measuring its circuit with a digital multimeter may not provide accurate information about its functionality due to the sensor's complex operation, which involves specific voltage or current changes in response to oxygen levels. Testing typically requires specialized diagnostic tools that can interpret the sensor's output signals under operating conditions.

The Air/fuel Ratio Sensor (AFS) Circuit Can Be Measured Directly