Code Enable Criteria

For DTC to run, the following conditions must be met:

• DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449, or P1441 are not set.
• System voltage is 9-18 volts.
• Intake Air Temperature (IAT) is less than 95°F (35°C) at start-up.
• Engine Coolant Temperature (ECT) is less than 95°F (35°C) at start-up.
• ECT and IAT are withing 11°F of each other.
• Average Mass Airflow (MAF) for sample period is less than 22.7 grams/second.

DTC will set when post-HO2S voltage remains within 150 mV of bias voltage (about 450 mV). Amount of time depends on engine coolant temperature at start-up, and on average airflow since start-up.