DTC P0133: Heated Oxygen Sensor No. 1 Circuit - Slow Response: Condition
WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when response time for Heated Oxygen Sensor (HO2S) No. 1 to change from lean to rich or from rich to lean is high (one cycle every 5 seconds) when engine is at normal operating temperature. This circuit is monitored once per drive cycle. MIL is illuminated when Engine Control Module (ECM) detects malfunction during 2 consecutive drive cycles. Possible cause is HO2S No. 1 malfunction.