P113D - O2 Sensor 1/1 Slow Response: Notes

For a complete wiring diagram, refer to appropriate wiring diagram.

Theory of Operation 

For an aged O2 Sensor, the response rate to the air/fuel change is slower than when it was new. The O2 Sensor tends to move less with the same air/fuel changes in a given time frame. Therefore by observing the activity of voltage readings from the upstream O2 Sensor, the quality of the O2 sensor can be detected. DTCs P113D and P113E are used to validate the high frequency switching of the O2 Sensor for DTCs P219A and P219B.

• >>When Monitored:<< With the Engine Coolant Temperature (ECT) at least 60°C (140°F), engine RPM between 1000 and 2750, minimum engine run time of 20 seconds and Manifold Absolute Pressure (MAP) reading is between 21 - 96 Kpa (6.2 - 28.3 in Hg).
• >>Set Condition:<< The Powertrain Control Module (PCM) detects that the Oxygen Sensor signal does not switch adequately at high frequency. Two Trip Fault. Three good trips to turn off the MIL.

Possible Causes
EXHAUST LEAK
(K99) O2 SENSOR 1/1 SIGNAL CIRCUIT
(K902) O2 SENSOR 1/1 RETURN CIRCUIT
O2 SENSOR 1/1

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to Engine .