Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
Have the known exhaust leak assessed and repaired, then recheck the code and sensor behavior under the conditions recorded in the freeze-frame data. If the fault remains, evaluate the sensor, heater circuit and mixture-control data using the matching diagnostic procedure. The reported resistance and airflow values are observations, not pass/fail specifications. Do not treat a cleaning attempt as a substitute for diagnosis.
Source discussion: question 1712904 https://2carpros.com/questions/o2-sensor-44882243--1712904 Supports the reported history and outcome only. Follow-up guidance is editorial synthesis; unverified specifications and diagnoses are not adopted. HELLA: Lambda-sensor diagnosis https://www.hella.com/techworld/uk/technical/sensors-and-actuators/test-lambda-sensor/ General oxygen-sensor diagnostic background. Sensor type and vehicle-specific conditions must be established before applying test limits.
p0133 Oxygen Sensor Circuit Slow Response?
The owner reported P0133 and an oxygen-sensor signal that responded slowly at idle but switched more quickly during driving. An exhaust leak near the manifold-to-converter connection was also reported. The contributor suggested repairing that leak before deciding whether the sensor needed replacement.
Reported outcome: No leak-repair result or confirmed sensor failure was reported.
The sensor type, test conditions and vehicle-specific limits were not established. The thread does not prove that the leak alone caused P0133.
