DTC P0133: Heated Oxygen Sensor No. 1 Circuit - Slow Response: Condition

DTC is set when time for Heated Oxygen Sensor No. 1 Circuit (HO2S-1) to change from lean to rich or from rich to lean is high. MIL is illuminated when Engine Control Module (ECM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• ECM malfunction.
• HO2S-1 malfunction.