DTC P0133 - Front O2S Circuit Slow Response
- Install scan tool. Start engine and check if DTC P0133 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent.
- Using scan tool, check lean/rich period. Scan tool display should read less than 2.6S. If reading is as specified, go to next step. If reading is not as specified, replace front O2S.
- Clear DTC. See CLEARING DTC(S) . Retest system. If DTC resets, replace ECM.