P0151 OBD-II Trouble Code

P0151 : Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 1) What this means This code refers to the first oxygen sensor (Sensor 1, commonly referred to as the upstream sensor because it is located upstream or in front of the catalytic converter) on Bank 2( bank two is the bank opposite of the number one cylinder of the engine). This means the O2 sensor's voltage stayed low for at least 2 minutes. The ECM see a low voltage condition and sets the Check Engine Light Code. Solution: Check wiring and if OK then replace the O2 Sensor