Home › Chrysler › 2003 › Voyager Base, 3.3 3 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 3.3L & 3.8L › Diagnostic Tests › DTC P0133: 1/1 O2 Sensor Slow Response Or DTC P0139: 1/2 O2 Sensor Slow Response › Possible Causes