Diagnostic Aids

WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0133 or slow response is most likely caused by one of the following conditions:

MAP sensor output that causes PCM to sense a higher than normal manifold pressure, or low vacuum, can cause system to go rich. Disconnecting MAP sensor will allow PCM to set a fixed value for MAP sensor. Substitute a different MAP sensor if rich condition is gone while MAP sensor is disconnected.
An intermittent TP sensor output can cause system to go rich due to a false indication of engine accelerating.
Check O2S 1 for silicone contamination from fuel or from use of an improper Room Temperature Vulcanizing (RTV) sealant. O2S 1 sensor may have a White powdery coating which will result in high but false voltage signal, indicating rich exhaust. PCM will then reduce amount of fuel delivered to engine, causing a severe surge or driveability problem.