O2 Sensor Circuit Slow Response

Diagnostic conditions 

• Engine speed between 1000 rpm and 3000 rpm
• Engine load (relative air charge) between 12 % and 70 %
• Calculated TWC temperature greater than 350°C
• Oxygen sensing system active

Possible cause of fault 

• Oxygen sensor is dynamically inert

Affected terminals 

II/9 and II/15