What is the P0156 fault number? What is the O2 Sensor Circuit Malfunction, Bank 2 Sensor 2 malfunction description? How can you fix P0156 fault code What are the causes and symptoms for the P0156 fault code
What is the P0156 fault code? What does it signify?
The O2 sensors measure the amount oxygen in the exhaust, and then transmit that information to the powertrain controller module (PCM). The oxygen sensor signal will fluctuate between low voltage or high voltage depending upon the exhaust condition. The PCM will assign fault code P0156 if the oxygen sensor voltage remains constant for a prolonged time or ceases to be active. “Bank 2” is the code’s description. “Sensor 2”, however, indicates the downstream oxygen sensor that follows the catalytic converter.
The smooth operation of an engine is dependent upon the availability of O2 sensors. The O2 sensors are used by the PCM to adjust fuel injection and ignition timing. To monitor the effectiveness of the catalytic convert, the downstream O2 sensor will be used.
Modern cars are equipped with a heated oxide sensor (HO2S), instead of a regular one. The sensor’s heating element allows it to reach its operating temperature faster. The engine can therefore enter the closed loop faster. The sensor is made up of four wires. Two wires supply the PCM with an aggregate circuit as well as a 0.5-volt reference voltage signal. The two remaining wires serve as the ground and supply wiring to the battery that supplies the heater component.
The O2 sensor will send a reference voltage signal ranging from 0.1 to 9 volts depending on the amount of oxygen in the exhaust. If the exhaust is 0.1 volts, it means that it’s lean. 0.9 is rich. If the voltage signal from a sensor is not receiving any signal or the sensor is in a fixed place for too long, the fault code P0156 will be triggered.
What is the P0156 Fault Code?
Below are some reasons to set fault code P0156:
- – Defective O2 sensor (Bank 2 Sensor 2)
- Leakage in the exhaust system
- – Leakage of air at the intake inlet
- – Defective fuel injectors
- – Frayed, torn, or rusty cables and connectors
- – Open or closed in wiring to the PCM
- – Exhaust vents are located around the O2 sensor
- Leakage of engine vacuum
- – O2 sensor cables in direct contact with the exhaust
- – Blown fuse (if any)
- – Extremely oily and dirty O2 sensor
- – PCMs that are rarely defective
What are the Symptoms of P0156 Problem Code?
These symptoms may be present in vehicles with code P0156.
- – Illumination for the check engine light
- – Increased fuel consumption
- – Higher emission values
- In extreme cases, black smoke could be produced if the operating conditions are very favorable.
- – An engine that is not in good running condition may have difficulty accelerating if this happens.
- Fluctuations of idle speed could occur
How to Fix the P0156 Fault Code
The following repairs may be able to resolve the P0156 fault code:
- – Repairing damaged, shorted or exposed oxygen sensor wiring
- – Repairing intake air intake leaks
- – Fixing engine vacuum leaks
- – If necessary, repair or replace the exhaust.
- – Reparation of cables touching exhaust parts
- – Replacing defective fuel injectors
- – Repair of blown fuse (if any)
- – Clean your O2 sensor.
- – Replacing the defective O2 sensor (Bank 2 Sens 2)
