2008 Corvette LS3 P0131 O2 Sensor Code After Replacement - How to Fix?

P0131 indicates the oxygen sensor is reading a stuck lean condition with low return voltage. Use an OBD-II scanner to monitor the live O2 sensor voltage. Then, intentionally enrich the air-fuel mixture by slightly increasing engine load or using carburetor cleaner sprayed into the throttle body—partially blocking airflow—to see if the sensor voltage rises. A response indicates a functional sensor; no change suggests deeper issues.

The error code has now shifted to P0171 — Fuel Trim Lean (Bank 1). This is a key indicator of an overall lean condition in the engine. A good starting point for diagnosis should be identifying potential causes such as vacuum leaks, clogged fuel injectors, or low fuel pressure.

P0171 points to a lean air-fuel mixture. Common causes include vacuum leaks, restricted fuel injectors, or insufficient fuel pressure. Begin by checking for any vacuum leaks—inspect hoses and connections. Try adding a can of fuel system cleaner (such as SeaFoam or Techron) to see if it resolves the issue. Also, verify whether your OBD-II scanner supports live data monitoring—including MAP sensor readings, fuel trims, and real-time O2 sensor voltages. These metrics will help determine if the problem is related to sensor performance or underlying system inefficiencies. The original P0131 code indicated a stuck low reading at Bank 1 Sensor 1—this new P0171 code reflects a similar lean condition in the same system.