Rick's Free Auto Repair Advice


Fix code P0133

Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1). This sensor is located on the engine bank that houses #1 cylinder and is located BEFORE the catalytic converter

The PCM sends a reference voltage (usually 5-volts) to the variable resistor in the oxygen sensor and looks for a return voltage. It expects to see a rapidly changing return voltage varying from .1-volts to .95-volts. If the voltage doesn’t switch rapidly, the PCM will set a trouble code P0133.

Most common causes are: “Lazy” worn sensor, contaminated sensor, leak in exhaust system

oxygen sensor, P0130

oxygen sensor wire colors

To learn how to replace an oxygen sensor, click here


© 2012 Rick Muscoplat


Posted on by Rick Muscoplat

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