1997 Ford Ranger V6 4L: P0171 and P0175 O2 Sensor Codes with No Feedback from All Six Sensors
Hello, I recently purchased a 1997 Ford Ranger with a V6 4.0L engine, which started showing up two diagnostic trouble codes: P0171 and P0174. After using an AutoEnginuity OBD2 scanner to check the system, I noticed that none of the six oxygen (O2) sensors are providing any feedback data. This is causing confusion about the root cause. I'm looking for help identifying whether this issue stems from a sensor failure or a more systemic problem such as vacuum leaks or fuel trim imbalances. Any insights into how to diagnose or resolve this would be greatly appreciated. Thanks in advance, Phillip
Are you looking for help with your OBD2 scanner not responding to the O2 sensors, or are you trying to diagnose the underlying fuel trim issue? Here's a hint: start with vacuum system checks and look for any potential leaks.