P0142 Code - O2 Sensor Circuit Malfunction Bank 1 Sensor 3

What Does P0142 Mean?

OBD-II Code P0142 is defined as a O2 Sensor Circuit

The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This information is critical to the PCM's ability to maintain efficient fuel economy. When the PCM detects a failure of the sensor or the information received from the sensor, it will set code P0142.

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What are the common causes of P0142 ?

• The O2 sensor bank 1 sensor 3 is downstream of the last catalyst in the exhaust system; an exhaust leak before the sensor can cause the code from excessive oxygen getting into the exhaust stream.
• The ECM detects a short or open circuit in the O2 bank 1 sensor 3 circuit.

What are the symptoms of P0142 ?

• The ECM does not use the input from this O2 sensor for controlling the engine fuel control, so this code should not account for any abnormal drive complaints.
• The Check Engine Light will be illuminated, indicating a problem with the downstream catalyst O2 sensor 3 for bank 1.

How to fix ?

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.



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