(alfa romeo, chrysler, dodge, fiat, jeep, maserati & ram), you can refer to this document. it gives specific outlines for diagnosing and repairing code p0520. every other brand has its procedure. but for the sake of those who can’t find their car’s tsb, here’s a general guide ...
P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2) P0159 O2 Sensor Circuit Slow Response (Bank 2 Sensor 2) P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2) P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sens...