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Malfunction Threshold

One of these symptoms occurs:

The A/F sensor (sensor 1) element resistance is more than 270 Ω for at least 38 seconds**.
The A/F sensor (sensor 1) element resistance is 270 Ω or less and the self-diagnosis function in the PCM judges as an occurrence of open circuit for at least 5 seconds*.

*: After the sensor becomes active

**: Before the sensor becomes active