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Author Topic: How to fix code Po156 96 mustang Saint ¯ Member # 2746 posted                              my check engine light came on so i pulled the codes and got po156. o2 sensor circuit malfunction (Bank 2, Sensor2). so i replace the passenger side o2 sensor and reset the computer and the light came back on. im not sure what to do now? Posts: 239 | From: Antioch | Registered: Apr 2003  |  : CDT ¯ Member # 5004 posted                                 did you change the one after the cat or before? -------------------- Custom Dyno Tuning 510.331.0608 Home of Flat Fee Tuning For All Cars, Trucks and SUV's, EFI & Carb, SCT, AFR, Dynatech, STS Turbos, N2O Refills Posts: 1053 | From: Hayward | Registered: Nov 2004  |  : Saint ¯ Member # 2746 posted                              after Posts: 239 | From: Antioch | Registered: Apr 2003  |  : Saint ¯ Member # 2746 posted                              ttt Posts: 239 | From: Antioch | Registered: Apr 2003  |  :

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