Hi-ya! good night, this day i will made an article about Error P0157 – how to fix?
Code Definition P0157
Low Voltage Oxygen Sensor Circuit (Bank 2 Sensor 2)
What does the code P0157 mean
The oxygen sensor referred to in error code P0157 is located on the rear of the exhaust system behind the catalytic converter. Its main task is to regulate the amount of oxygen leaving the catalyst. A mixture that is low in oxygen and gas means that there is too much oxygen in the exhaust gas. The mixture of oxygen-rich gases means that there is not enough oxygen in the exhaust gas.
Neither a lean nor a rich mix is good for the catalyst and both can damage it prematurely. The oxygen sensor switches from low voltage (lean) to high voltage (rich). When this code is written by the Power Control Module (PCM), the oxygen sensor has been at low voltage for too long.
What causes the code P0157?
- Defective oxygen sensor (bank sensor 2)
- Insufficient fuel pressure
- False oxygen sensor readings due to exhaust vents
- Corrosion of the rear oxygen sensor connector
- Leakage of fuel or coolant at the rear oxygen sensor
- Damaged, shorted, or exposed wires
- Engine coolant temperature sensor malfunctioning
- Defective Power Control Module (PCM)
- Power control module (PCM) needs to be upgraded.
What are the symptoms of the P0157 code?
- Increased fuel consumption
- The engine light comes on
- Engine runs sluggish or idling
- In some rare cases, the driver will not notice any symptoms.
How does the mechanic diagnose the P0157 code?
- Read the fault code and view the frozen data frames from the OBD-II scanner.
- He also uses a scan tool to monitor the oxygen sensor voltage to see if it is changing properly.
- If an engine coolant temperature sensor fault code is also present, review its live data to see if it is working properly.
- Check the fuel pressure with a pressure gauge. Proper fuel pressure should be 40 psi.
- Check the exhaust for air leaks at the manifold and pipes.
- Check the rear oxygen sensor wiring for short circuits, openings, or exposures.
- The computer may need to be updated at the dealer.
- Initial diagnostics may also be necessary to determine if there is a problem with the main control module (PCM).
The most common errors when diagnosing the P0157 code
- Replace the oxygen sensor without confirming that it is faulty.
- No control of the condition of the oxygen sensor wiring harness
- Failure to check the exhaust gas status
How serious is the P0157 code?
Trouble code P0157 is considered to be moderately severe. This can cause problems with driving the car and may cause the car to stop. If not corrected, it could eventually damage the catalytic converter, which would be expensive to repair. It is recommended that you fix this problem as soon as possible.
What repairs can fix the code P0157?
- Replacing the rear oxygen sensor
- Repair any damaged circuits or shorted wires to the oxygen sensor.
- If the fuel pressure is incorrect, correct the cause of the fault.
- Repair the engine coolant temperature sensor if it is damaged.
- Replace the power control module (PCM) or retrofit as needed.
Additional notes regarding code P0157
If the oxygen sensor has stopped working in the exhaust pipe, which is common, special tools will be needed. The oxygen sensor kit will provide access to the troublesome oxygen sensor, and the propane burner is used as a heating element for easy removal.
Code Definition P0157
Low Voltage Oxygen Sensor Circuit (Bank 2 Sensor 2)
What does the code P0157 mean
The oxygen sensor referred to in error code P0157 is located on the rear of the exhaust system behind the catalytic converter. Its main task is to regulate the amount of oxygen leaving the catalyst. A mixture that is low in oxygen and gas means that there is too much oxygen in the exhaust gas. The mixture of oxygen-rich gases means that there is not enough oxygen in the exhaust gas.
Neither a lean nor a rich mix is good for the catalyst and both can damage it prematurely. The oxygen sensor switches from low voltage (lean) to high voltage (rich). When this code is written by the Power Control Module (PCM), the oxygen sensor has been at low voltage for too long.
What causes the code P0157?
- Defective oxygen sensor (bank sensor 2)
- Insufficient fuel pressure
- False oxygen sensor readings due to exhaust vents
- Corrosion of the rear oxygen sensor connector
- Leakage of fuel or coolant at the rear oxygen sensor
- Damaged, shorted, or exposed wires
- Engine coolant temperature sensor malfunctioning
- Defective Power Control Module (PCM)
- Power control module (PCM) needs to be upgraded.
What are the symptoms of the P0157 code?
- Increased fuel consumption
- The engine light comes on
- Engine runs sluggish or idling
- In some rare cases, the driver will not notice any symptoms.
How does the mechanic diagnose the P0157 code?
- Read the fault code and view the frozen data frames from the OBD-II scanner.
- He also uses a scan tool to monitor the oxygen sensor voltage to see if it is changing properly.
- If an engine coolant temperature sensor fault code is also present, review its live data to see if it is working properly.
- Check the fuel pressure with a pressure gauge. Proper fuel pressure should be 40 psi.
- Check the exhaust for air leaks at the manifold and pipes.
- Check the rear oxygen sensor wiring for short circuits, openings, or exposures.
- The computer may need to be updated at the dealer.
- Initial diagnostics may also be necessary to determine if there is a problem with the main control module (PCM).
The most common errors when diagnosing the P0157 code
- Replace the oxygen sensor without confirming that it is faulty.
- No control of the condition of the oxygen sensor wiring harness
- Failure to check the exhaust gas status
How serious is the P0157 code?
Trouble code P0157 is considered to be moderately severe. This can cause problems with driving the car and may cause the car to stop. If not corrected, it could eventually damage the catalytic converter, which would be expensive to repair. It is recommended that you fix this problem as soon as possible.
What repairs can fix the code P0157?
- Replacing the rear oxygen sensor
- Repair any damaged circuits or shorted wires to the oxygen sensor.
- If the fuel pressure is incorrect, correct the cause of the fault.
- Repair the engine coolant temperature sensor if it is damaged.
- Replace the power control module (PCM) or retrofit as needed.
Additional notes regarding code P0157
If the oxygen sensor has stopped working in the exhaust pipe, which is common, special tools will be needed. The oxygen sensor kit will provide access to the troublesome oxygen sensor, and the propane burner is used as a heating element for easy removal.
