Conditions for Running the DTCs

P0137

• DTCs P0117, P0118, P0125, and P0128 are not set.
• The engine is operating for greater than 1 second.
• The HO2S heater is at operating temperature for greater than 10 seconds.
• The ignition 1 voltage is greater than 11 volts.
• The engine coolant temperature (ECT) is less than 40°C (104°F) at start-up and the ECT was greater than 60°C (140°F) when the ignition was turned OFF last ignition cycle.
• The calculated exhaust temperature is between 250-800°C (482-1,472°F).
• DTC P0137 runs continuously once the above conditions are met for greater than 90 seconds.

P0138 or P0140

• The engine is operating.
• The HO2S heater is at operating temperature for greater than 10 seconds.
• The ignition 1 voltage is greater than 11 volts.
• The calculated exhaust temperature is between 250-800°C (482-1,472°F).
• DTCs P0138 and P0140 run continuously once the above conditions are met for greater than 90 seconds.