P0152 - HEATED OXYGEN SENSOR (HO2S) / OXGEN SENSOR (O2S) 1, BANK 2 – HIGH VOLTAJE

Oxygen Sensors (O2) measure the oxygen content in the exhaust and send that information to the Powertrain Control Module (PCM). It uses this information to regulate the injector pulse as well as the fuel supply. The O2 Sensors have a heating element, which allows the sensor to reach a higher temperature and achieve a closed cycle in less time than it would normally take to heat the sensor in the exhaust.

The PCM provides the Oxygen Sensor with a ground circuit, in addition to a reference voltage which is usually 5 volts. Also for the sensor heater there is a cable that provides battery voltage and a ground. The reference voltage of the sensor changes according to the oxygen content in the exhaust. That variation is between 0.1 to 0.9 volts. The lower voltage being a poor exhaust and the higher voltage a rich exhaust.

If the PCM detects a signal voltage that is above the range determined by a time lapse, the Check Engine lamp will illuminate and DTC code P0152 OBDII will be set.

• MIL light on.
• Engine malfunction.
• Loss of power.
• Increased fuel consumption.

The diagnostic code P0152 OBD2 is set when:

• The Oxygen Sensor may be shorted to voltage or ground.
• O2 Sensor wires may be defective due to contact with exhaust components.
• Oxygen Sensor 1 of Bank 2 defective.
• Vacuum leakage may occur.
• Fuel injectors may leak.
• Pressure regulator may be defective.

To resolve problems related to error code P0152 OBDII you must do the following:

• Check the fuses and cables for faults. If there are burnt or corroded cables, you must repair or replace them. Also inspect the Oxygen Sensor connectors and make sure there are no bent pins.
• Test for leaks. Pay special attention between the Catalytic Converter and the Oxygen Sensor. Repair if you find defects.
• Check the continuity of the O2 Compare with the manufacturer's specifications and if there is infinite resistance, there is a short in the circuit. Make the necessary repairs. In case the resistance is correct you must change the sensor.