Posts Tagged: P0133 code

P0133 Code: What It Means, What Causes It, and How to Fix It

Understanding the P0133 Code and Oxygen Sensor Operation Quick Summary The P0133 code indicates that the upstream oxygen sensor on Bank 1 Sensor 1 is responding too slowly. In other words, the sensor is no longer switching between rich and lean readings fast enough for the engine computer to properly control the air-fuel mixture. The most common causes of a P0133 code include • A worn oxygen sensor • Exhaust leaks, • Contaminated sensors, • Wiring problems, or • Engine issues that affect fuel trim. Diagnosing the problem requires checking … Read More