DTC P0133: Primary Heated Oxygen Sensor Slow Response

NOTE: If DTCs P0131, P0132 or P0135 are present, troubleshoot these before proceeding.

Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and run at 3000 RPM, with no load (in park or neutral) until radiator fan comes on. Go to next step.
Test drive vehicle at a constant 55 MPH, with transmission in "D5" position (D4 position on 3.2TL model) until readiness code or temporary DTC P0133 comes on. If temporary DTC P0133 sets, replace Primary Heated Oxygen Sensor (HO2S-1). If temporary DTC P0133 does not set, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between HO2S-1 harness connector and PCM 31-pin harness connector. See WIRING DIAGRAMS article.