P0157 Code - O2 Sensor Circuit Low Voltage Bank 2 Sensor 2

What Does P0157 Mean?

This error code refers to the O2 sensor behind the catalytic converter, at the back side of the exhaust. The main function of this sensor is to regulate the amount of oxygen that gets inside the catalytic converter. Lean mixture of O2 and gas means there is too much oxygen in the exhaust, while a rich mixture of O2 and gas means there is not enough oxygen in the exhaust.

The catalytic converter works by helping tailpipe control the emissions and ‘clean up’ the exhaust. The PCM then uses the signal from heated O2 sensor to the rear catalyst to check the efficiency of the catalytic converter by comparing it in the O2 sensors in front of the catalyst.

When the PCM sees there is very little or no difference between the quality of the exhaust in post and pre-catalyst sensor, it will conclude that the catalytic converter is having trouble. To simplify, the job of the post catalytic converter sensor it to monitor the catalyst efficiency, and NOT control fuel, though it can influence through the operation of the O2 sensor.

There should be a perfect balance in the mixture level of oxygen and gas, as neither lean nor rich is good for the catalytic converter as both can cause it to fail prematurely. The O2 sensor switches back and forth from lean to rich fast. Error Code P0157 is set when the PCM determines that the O2 sensor has been in low voltage longer than specified time. This means the signal voltage Bank 2 Sensor 2 of the O2 sensor is below normal.

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What are the common causes of P0157 ?

Depending on year, make, and model, DTC P0157 may have number of causes. Here are some of the most common.

• HO2S Fault – The most common failure is a fault in the sensor itself. Constantly exposed to the elements and to the heat of exhaust, HO2S has a typical lifespan of less than 5 years.
• Circuit Fault – Because they are exposed to the elements, wire harnesses, connectors, and the sensor itself may be physically damaged by impact or road debris. Water entry and corrosion are common faults.

What are the symptoms of P0157 ?

These could include a lean or rich condition in the engine, decreased fuel efficiency, black smoke from the tailpipe, and an illuminated service engine soon lamp.

How do you troubleshoot P0157 ?

Replacing the rear oxygen sensor
Repairing of broken circuitry or shorted wires going to the oxygen sensor
If the fuel pressure is abnormal, repairing the cause of the abnormality
Repairing the engine coolant temperature sensor if it is faulty
Replacing the power control module (PCM) or having it updated, if necessary



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