DTC P0133: Primary HO2S (Sensor 1) Slow Response NOTE: If DTC P0131, P0132 and/or P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first, then recheck for DTC P0133. Reset the ECM/PCM (see page 11-4). Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on. Test-drive under the following conditions: 89 km/h (55 mph) steady speed A/T in D position (M/T in 5th gear) Until readiness code or Temporary DTC P0133 comes on Check for a Temporary DTC with the scan tool. Is Temporary DTC P0133 indicated? YES - Replace the primary HO2S (Sensor 1). NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the primary HO2S (Sensor 1) and the ECM/PCM.