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What Causes High Voltage In O2 Sensor. P0138 is a common OBDII code that occurs in many vehicles including the Lexus IS 300. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
Oxygen Sensors What Happens When O2 Sensors Age Or Die Autosuccessonline from www.autosuccessonline.com
This code is triggered when the PCM or powertrain control module detects that your heated oxygen sensor reading is too high. The ECM detects the voltage high problem and turns on the Check Engine Light. 9V there is an excess of fuel in the mixture.
This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.
The engine control module ECM sees the voltage of the O2 sensor for bank 1 sensor 2 above 12 volts when the ECM has commanded the fuel to a targeted lean condition on that bank of the engine. The O2 sensors sensing ability comes about by producing a small voltage proportionate to the exhaust oxygen content. However at the high and low points of these. An O2 sensor will cycle between 010 to 090 or almost 1 volt.
