P2A11 OBD Error Code: Problem & Solutions

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Is your Car’s Check Engine Light illuminating on the dashboard? Do you find sudden decrease in the fuel economy? And is the car engine running rough with black smoke coming from the tailpipe? This might be an indication of problems with the oxygen sensor of the car which in other words can be an OBD P2A11 error.

OBD code P2A11 means O2 Sensor Negative Voltage Bank 2 Sensor 3 Issue

The oxygen sensor measures the oxygen content in the exhaust gases after they leave the combustion process of the engine. The engine control module (PCM) constantly adjusts the amount of fuel delivered to the engine based off of the oxygen sensor's signal. If the PCM notices negative oxygen sensor 3 bank 2 voltage, it will set code P2A11.

The Powertrain Control Module (PCM) continuously monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During the monitor period the PCM counts the number of times that the HO2S responds from rich to lean and from lean to rich and adds the amount of time it took to complete all transitions. With this information, the PCM determines the average time for all transitions and if the average response time is too slow, a DTC is set.

What causes this problem with the O2 Sensor Negative Voltage Bank 2 Sensor 3?

• Defective/Damaged O2 sensor
• Burnt, broken, or disconnected wiring and connections related to sensor and circuit
• Defective/Faulty catalytic converter
• Engine exhaust leakages
• Faulty/Clogged fuel injectors
• Exhaust gas leakages

1. Engine Control Module - If there is any corrosion or breaks in the internal wiring of the harness, then it can cause a short in the ECM or can also cause corrosion in the ECM through the wiring harness. You can always rely on us as we have the best auto parts for our customers.
2. Powertrain Control Module - The onboard computer, or powertrain control module is the brain of the engine control system. Now if the brain is not working properly, then neither is the car engine. Get it replaced before the situation gets worse.
3. Fuel Injector - The fuel injectors are an important component of the fuel delivery system that helps in proper utilization of the fuel entering the engine. This not only helps in taking care of the air to fuel ratio in the engine, helping the combustion process but also enhances the performance. Thus, replace faulty injector now!
4. Exhaust Gas Recirculation Valve - It is auto part commonly found on many road going automobiles. It is a part of the vehicle’s exhaust gas recirculation (EGR) system, an emissions system that is designed to recirculate exhaust gases back into the vehicle’s intake so that it can reduce cylinder temperatures and NOx emissions. Purchase top notch exhaust gas recirculation valve from us at economical prices.
5. Electronic Control Unit - Is your car jump starting on reverse polarity? Or are you facing some intermittent starting issues? If yes, then it indicates that your electronic control unit is bad. So it is very important to replace the defective electronic control unit with us at equitable prices.
6. Diagnostic Tools - Buy quality diagnostic tools to check and diagnose OBD code P2A11 error with the help of experienced mechanic. Visit us today!
7. Mass Air Flow Sensor - If the sensor is unable to measure the air flow pressure correctly, it will hamper the air intake system and fuel delivery system. Replace faulty sensors immediately.
8. Catalytic Converter - Excessive amounts of unburned gas caused by a misfiring spark plug or a leaky exhaust valve can cause overheating of the catalytic converter. Replace your old catalytic converter now!
9. Manifold Absolute Pressure Sensor – Problematic MAP sensor can cause excessive fuel consumption, lack of power, and increased emission from the exhaust. Thus, replace faulty sensors now!
10. Intake Valve - Burnt valve can cause increased fuel consumption, affected engine performance, rough idles and engine stalling and not starting. Thus replace damaged valves immediately.
11. PCV Valve - Faulty PCV valve can cause increased internal engine pressure, failure of oil seals and gaskets, engine oil leaks and much more. Thus, it is important to replace them, if found faulty.
12. Manifold Gasket Set - Damaged intake gasket can cause engine misfires with affected power, acceleration and fuel economy. Thus, replace them now!
13. Oxygen Sensor - An oxygen sensor plays a vital role in the fuel delivery system and air to fuel ratio mixing functions. Without this sensor proper combustion of fuel cannot take place, thus causing performance issues. Also the exhaust system will not be able to detect the emissions properly if this sensor becomes inactive, resulting in increased emissions from the exhaust. Thus replace faulty oxygen sensor today!
14. Fluid Pump Control Module - Faulty fluid pump control module will result in the fluid pump not working properly. This will cause transmission issue and erratic behaviours. Replace faulty control module immediately.
15. Engine Coolant Temperature Sensor - The most common symptom which is associated with the issues in the engine coolant temperature sensor is the poor fuel economy. Reduction in the fuel economy would also hinder engine performance. Purchase top notch engine coolant temperature sensor online

If you are facing OBD error code P2A11, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Reduced fuel efficiency
• Lack of engine performance
• Engine stalling and not starting
• Check Engine Light illumination

It is very important to fix the fault code P2A11. So here are some ways with which you can correct this issue:

• Replace the Oxygen Sensor 3 on Bank 2
• Fixing the issues in the circuit connection
• Reattachment of connectors properly
• Repairing open or shorted wiring
• Repair the fuse of the heater circuit
• PCM (or ECM) replacement
• Replacing the catalytic converter

However, if you face any issue then we have stocked a wide range of best priced ECM, Oxygen Sensor, PCM, Engine Solenoid Valve and more to help you out in fixing your car.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• Visually inspect system wiring harnesses and connectors. Focus on harnesses that are routed near hot exhaust pipes and manifolds, as well as those that are routed near sharp edges like the ones found on exhaust shields.
• Search technical service bulletins (TSB) in your vehicle information source. If you find one that matches the symptoms and code/s presented by the vehicle in question, it will very likely aid you in the diagnosis as TSB listings are compiled from thousands of successful repairs.
• Connect the scanner to the vehicle diagnostic port and retrieve all stored trouble codes and freeze frame data. This information is helpful if the P2A11 proves to be intermittent so write it down for later. Now, clear the codes and see if the P2A11 is reset.
• If the code is reset, start the engine, allow it to reach normal operating temperature, and then let it idle (with the transmission in neutral or park). Use the scanner data stream to observe O2 sensor input data.
• Data stream display is narrowed to include only pertinent data and you will see a faster and more accurate data response. If the engine is running efficiently, upstream O2 sensor data should fluctuate regularly between 1-millivolt (.100-volts) and 9-millivolts (.900-volts). If voltage fluctuations are slower than expected or negative, a P2A11 will be stored.
• Connect the DVOM test leads to the sensor ground and signal wires in order to monitor live data from the O2 sensor. Also check the resistance of the O2 sensor in question, as well as voltage and ground signals. To prevent control module damage, disconnect related controllers prior to testing system circuit resistance with the DVOM.

Common Mistakes When Diagnosing the P2A11 Code

Always follow the complete diagnostic procedure without skipping any steps is required as to avoid unneeded repairs. Monitoring the sensor data from the scan tool live data stream is the only way to check for proper operation, and the sensor should not be replaced until it is tested. Check for the following problems:

• Wiring and connector issue
• Exhaust leakages
• O2 sensor problematic

P2A10 - O2 Sensor Negative Voltage Bank 2 Sensor 2