Saturn Vue: P0155, P0300-306 codes

Question

P0155, P0300-0306 codes. 06 saturn Vue V6 AWD, 145,000mi. Changed spark plugs and coils last year. Replaced computer. Had fuel injectors cleaned. Had 0300-0306 codes for over a year, 0155 code just came up. Any suggestions?

Answer 1

P0155 -02 sensor heater circuit malfunction Bank 2 Sensor 1

The most hard working part of the 02 sensor has to be the heater circuit, what the heater circuit does is warm up the 02 sensor and maintane its temperature so it can  give   feedback for the ECM to help maintain fuel control. Here is a P0155 that has done its job over its year and mileage of service. The fix is to replace the sensor.