Rick's Free Auto Repair Advice

P0133

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.

For more information on this repair or any others for your vehicle, buy an online subscription to either Alldatadiy.com or eautorepair.net. Click on this link to compare the two services: Compare Alldata and Eautorepair.

You need a professional shop manual to work on a late model vehicle. And you need access to the latest technical service bulletins so you don’t waste time and money replacing parts that may misbehave due to a manufacturer’s software glitch. Forget about those cheap manuals you find at the auto parts store. They will just lead you astray. Here are the two best online shop manuals around.

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Get a 1-Month subscription (31 Days) for $16.99, 1-Year (Best Value!) for $25.99, or a    4-Year (Best Value!) for $39.99. I like the wiring diagrams in Eautorepair.net better than the hard-to-read factory diagrams on Alldatadiy. However, Eautorepair.net doesn’t show how to remove trim or door panels. Alldata does.

AlldataDIY.com is simply Alldata with a consumer style interface. They have a different pricing model. But a 1-year subscription for $26.95. Add additional vehicles for $16.95 for a year. Or, buy their 5-year subscription for $44.95. Add additional vehicles for $29.95 for five years.

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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