Rick's Free Auto Repair Advice


P0133 – Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)

A P0133 trouble code means the oxygen sensor response doesn’t meet proper criteria. An Oxygen sensor must switch constantly between .27 and .62 volts.

oxygen sensor, P0133

P0133 refers to the oxygen sensor from bank 1 and is before the catalytic converter

The engine computer waits until the engine has reached at least 145 degrees and the vehicle has driven at least 10MPH for 30 seconds before it starts looking at the switching rate. The computer looks for about 8 voltage changes per second (these are called CROSS COUNTS). If it sees less than that, it sets this code, telling you that you have a “lazy sensor.”

Oxygen sensors wear out between 80,000-100,000 miles. But they can also be damaged by coolant, silicone, and engine misfires. If you have this code, chances are your Oxygen sensor needs to be replaced.

Bank 1 denotes the #1 spark plug side of the engine. Sensor 1 refers to the sensor BEFORE the catalytic converter.

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© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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