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5. AGING O2 SENSOR A new rear O2 Sensor along with an aging front O2 Sensor may cause the DTC to set. Review the vehicles repair history. Has the rear O2 Sensor been replaced without replacing the front O2 Sensor? Yes >> Replace the Front O2 Sensor as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 6 6. CATALYTIC CONVERTER If there are no possible cause remaining, view repair. Repair Replace the Catalytic Converter. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 412 ENGINE ELECTRICAL DIAGNOSTICS LX |