P0151 OBD Error Code: Problem & Solutions

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The P0151 fault code can be defined as an oxygen sensor circuit low voltage bank 2 sensor 1. This code would start showing up when the powertrain control module would determine that the voltage given by the sensor is low than the specified limit or is failing to improve the voltage output more than 0.21V, which would indicate excessive amount of oxygen in the exhaust.

It is a generic OBD code which applies to all the vehicles from 1996 to present. The ways of troubleshooting this fault code would vary from one vehicle make to another. This fault code is triggered to track the time the air fuel ratio or the oxygen sensor would take to go from determining that the fuel control system is in open loop and rapidly switch above as well as below 450 millivolt set point. This would indicate that the fuel control system is in closed loop. That’s why there is a sustained low voltage signal from the oxygen sensor for a specified amount of time, then the fault code P0151 would start appearing.

What causes this problem with the O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)?

• The engine control module might see the voltage of the oxygen sensor for bank 2 sensor 1 below .21 volts when the engine control module has commanded the fuel to a targeted rich condition on that bank of the engine
• Leakage in the exhaust before the car sensor introduce excessive oxygen into the exhaust, causing the O2 sensor to read excessive oxygen, and the engine control module to run rich

1. Exhaust Parts - Do you remember when was the last time you got your car Exhaust Parts checked up? Damaged Exhaust Parts can cause a lot of issues like displaying P0151 code.
2. Engine Control Module - Engine Control Module is an important car part which should never be neglected. May be there is some fault in it due to which P0151 code may start flashing.
3. Fuel Delivery System Parts - Is your Fuel Delivery System damaged or broken? Don’t worry as we have solutions for all your problems. Buy Fuel Delivery System Parts from us at affordable prices.
4. Fuel Injector - Defective car Fuel Injector can be a major reason why P0151 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
5. Powertrain Control Module - Everything is okay with the ECM and still OBD code P0151 triggering? Then there must be some defects in Powertrain Control Module. Replace them as soon as possible.
6. Engine Parts - P0151 code flashing? Get your Engine Parts inspected from a mechanic. You can shop high end engine parts with us.
7. Oxygen Sensor - Oxygen Sensor is an important auto part. Take care of your heated oxygen sensor and you can rely on us to purchase best quality Oxygen Sensor online.
8. Air/Fuel Sensor - There can be some defects in the Air/Fuel Sensor due to which P0151 code may come on again and again. Make sure to replace it or else you may have to face some major issues.
9. Exhaust Pipe - A lot of issues can arise do to defective Exhaust Pipe. Did you just see P0151 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.

Willing to know some common symptoms of OBD Code P0151? Your wish is our demand. Have a look at them below:

Common Symptoms

• The low voltage in the oxygen sensor can cause the engine control module to enrich the mixture into the engine
• There can be an illumination in the check engine light
• You may have to experience exhaust leaks before or near the O2 sensor in question. There can be an increase in the exhaust leaks when the engine is cold, and decrease as the engine warms up

It is very important to fix the fault code P0151. So here are some ways with which you can correct this issue:

• The O2 sensor for bank 2 sensor 1 should be replaced if a failed sensor has been indicated in all the tests
• The wiring or connection to the O2 sensor for bank 2 sensor 1 should be repaired or replaced it required
• You can always repair the exhaust leaks before the sensor that introduce excessive oxygen into the exhaust

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• The oxygen sensor should be tested properly as suggested by the manufacturer and compare your findings with manufacturer’s specifications
• The sensor should be repaired as needed and clear the codes afterward
• Test drive the vehicle afterwards to ensure that a successful repair was performed. If the oxygen sensor conforms to the manufacturer’s specifications, prepare to test system circuits for resistance and continuity by disconnecting the electrical connector/s from all related control modules (especially the PCM)
• The manufacturer’s service manual should be consulted and perform continuity and resistance testing on all system circuits
• Make sure that you compare your actual findings with manufacturer’s specifications and repair or replace circuits, components, or connectors as required
• Now once the repairs are made, clear the codes and test drive the vehicle to ensure that the repair was successful. If oxygen sensor and system circuits are comparable to the manufacturer’s specs, suspect a defective powertrain control module
• Failure with the controller is extremely rare and replacement of such will require reprogramming. Test voltage to the individual sensor heater circuits (power and ground) using a voltage drop method
• The test voltages should be near that of the fully charged battery

Common Mistakes When Diagnosing The P0151 Code

• You must follow these simple guidelines if you wish to prevent misdiagnosis:
• If there are any sort of exhaust leaks, then they should be repaired before the sensor to prevent excess oxygen getting into the exhaust stream, leading to low voltage readings
• The oil as well as coolant leaks should be repaired which can contaminate or can foul the sensors

P0131 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

P0137 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

P0143 - O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

P0157 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)

P0163 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)