P0133 - O2 Sensor 1/1 Slow Response: Notes
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.
- >>When Monitored:<< With the Engine Coolant Temperature Sensor above 70°C (158°F), engine RPM between 1400 and 2300, vehicle speed between 64 and 96 kph (40 and 60 mph), and engine run time greater than three minutes.
- >>Set Condition:<< The Powertrain Control Module (PCM) detects that the oxygen sensor signal does not switch adequately during monitoring. Two Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
|---|
| EXHAUST LEAK |
| (K41) 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 Pre-Diagnostic Troubleshooting Procedure .