Posts Tagged: p0133 trouble code

P0133: What it means and how to fix it

Learn what a P0133 code means and how to diagnose and fix it A P0133 trouble code is defined as: “Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1).” Bank #1 is the portion of the engine that houses cylinder #1. Sensor 1 is the sensor located BEFORE the catalytic converter. The PCM expects to see a rapidly changing value from this sensor, a value that corresponds to the rapidly changing air/fuel mixture. When it doesn’t see rapid switching, it sets a P0133 code. The PCM sends a reference voltage … Read More