P0133 O2 Sensor Circuit Slow Response Bank 1: What It Means, Why It Happens, and How to Fix It
The P0133 code indicates that the upstream oxygen sensor on Bank 1 is cycling between rich and lean signals at a rate too slow to meet the OBD-II minimum threshold for adequate closed-loop fuel control. A healthy upstream O2 sensor switches between approximately 0.1 volts (lean) and 0.9 volts (rich) at least 8 times per […]