Error Code P2A10: What It Means & What To Do?

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The major symptom of OBD code P2A10 is the increased emission coming from the vehicle due to the oxygen sensor taking longer to reach its operating temperature. This increase in emissions due to problems in the control circuit, is what causes the Check Engine Light to come on so that the vehicle can be repaired as soon as possible.

OBD code P2A10 means O2 Sensor Negative Voltage Bank 2 Sensor 2 Issue.

The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. The oxygen sensor must be at a certain temperature in order for this information to be accurate. The oxygen sensor has a heater wire inside to help bring the sensor up to temperature quicker.

Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees Fahrenheit to generate an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).

When the PCM detects a negative voltage in the Bank 2 Sensor 2 oxygen sensor, OBD code P2A10 gets stored.

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

• Faulty Oxygen Sensor 2 Bank 2 due to circuit problems
• Sensor wiring and harness short problem
• Poor electrical connections to the sensor
• Heated Oxygen Sensor (H2OS) damaged circuit fuse
• Problematic Engine Control Module hampering the engine performance

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
2. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some faults with the automobile’s EGR valve circuit, then it would set up the check engine light so that the driver is notified about the fault. Don’t waste time and get them replaced or else this fault code can turn up.
3. Diesel Exhaust Fluid Pump - The diesel exhaust fluid pump needs to work properly if the transmission system has to perform. If it is not functioning, the transmission may slip and cause harsh shifts too. Thus replace faulty pump now and buy a new one from us!
4. Fuel Injector - Facing some issues in starting your vehicle? Poor idle issues? Failed emissions? These are all the symptoms of bad, faulty, leaking and clogged fuel injectors. It would be a good decision to replace your defective fuel injector with a new one online.
5. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use the correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in an efficient manner. Buy new quality diagnostic tools from us today!
8. Mass Air Flow Sensor - Replace faulty MAF sensor to avoid wrong reading of the intake air sending to the PCM, thus affecting the fuel delivery system. Buy new sensors from us now!
9. Fluid Pump - If the fluid pump is physically damaged, it can result in leakage, loss of pressure and harsh shifting. Thus, the fluid pump must be replaced, if found damaged. Buy new fluid pump from us now!
10. Engine Wiring Harness - The broken wires in the wiring harness might lead to some serious engine problems. So make sure that you replace your faulty engine wiring harness to avoid such a situation.
11. Oxygen Sensor - Inspect for faulty O2 sensor that can affect the engine combustion process and the exhaust emissions. Thus, it is important to understand its importance and replace faulty oxygen sensor now!
12. Engine Coolant Temperature Sensor - The engine coolant temperature sensor is also known as the coolant temperature switch. It is an engine management system sensor which is utilized to monitor the temperature of the engine’s coolant. If there are any faults in the ECT sensor, then it would lead to engine performance issues. Purchase high grade engine coolant temperature sensor from us online.

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P2A10 code by listing out some major symptoms. They are mentioned below as follows

Common Symptoms

• Increased hydrocarbon emissions
• Check engine light illuminated
• Fuel economy inconsistent
• Erratic Idle
• Excessive smoke from exhaust

Learn the ways with which you can correct this trouble code:

• Inspect the oxygen sensor 2 bank 2 wiring for damaged or loose wiring to the sensor and test the resistance of the heater circuit using a wiring diagram for reference.
• If the heater circuit inside the sensor has some resistance present, excessive resistance or an over limit reading, it would indicate faulty oxygen sensor will need to be replaced.
• Check for power supply to the oxygen sensor. If no power is present at the connector during cold start, there may be a problem with the power supply circuit to the oxygen sensor or the PCM itself which need immediate replacement.

Don’t get tensed if you are still facing any of these issues as we care for our customers and that’s why we offer a good range of ECM, Oxygen Sensor, PCM and a lot more. We are sure that now all your issues would be resolved.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2A10 code to be stored:

• The first step is to complete a visual inspection of the wiring for the bank 2 sensor 2 oxygen sensor.
• Many times, this code can be set due to damaged wirings which are wrongly routed or damaged by road hazards.
• The next step is to measure the resistance of the heater circuit in the oxygen sensor itself.
• If the resistance of the sensor is not as per the specifications then it is faulty and the oxygen sensor is needed to be replaced.
• If the sensor checks out to be in perfect condition, then we must check the resistance of the rest of the circuit from the powertrain control module to the connector of the bank 2 sensor 2 oxygen sensor. A normal reading for wiring is less than half an ohm.
• If the rest of the wiring is found to be good then the likely problem is with the powertrain control module itself. 

Common Mistakes When Diagnosing the P2A10 Code

Though the sensor itself is generally the cause of P2A10, using the proper tools and following 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.

P2A10 has easily managed symptoms but like any other code, it should be repaired at the earliest convenience. In rare cases where the vehicle runs poorly and the fuel economy goes down, caution is advised when driving to avoid any issues

P2A11 - O2 Sensor Negative Voltage Bank 2 Sensor 3