What oxygen sensor codes mean Understanding oxygen sensor trouble codes Oxygen sensors and air fuel ratio sensors have two separate components; the heater and the sensor. When you get an oxygen sensor code, it does NOT automatically mean the sensor is bad. In fact, 80% of all oxygen sensors returned under warranty are perfectly good. In other words, they were telling the truth and weren’t the cause of the trouble code. Oxygen sensor locations A Bank 1 sensor is located on the engine bank that holds Cylinder #1 A Bank … Read More
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