P2202 OBD Error Code: Problem & Solutions

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The trouble code P2202 can be explained as NOx Sensor Circuit Low Bank 1 Issue. The steps of troubleshooting would differ depending upon manufacturer, type of fuel system, type of mass airflow sensor (MAF) and wire colors and type of air/fuel ratio sensor/oxygen sensor (AFR/O2) and wire colors. P2202 is an OBD-II generic code for the engine control module (ECM) on a diesel engine vehicle with a NOx sensor detecting the sensor signal is low on bank 1.

Diesel Exhaust Fluid (DEF) helps in converting harmful exhaust particles to harmless gases. For burning these particles, the temperature of the exhaust system has to be increased. The DEF Fluid with the help of the injector is sent into the exhaust stream to raise the Diesel Particulate Filter (DPF) up to optimal temperature. The exhaust system then converts harmful nitrous oxide compounds to nitrogen, carbon dioxide, and water. The reductant pump transfers the DEF (Diesel Exhaust Fluid) from the tank to the DEF Injector and if the NOx sensor fails to perform as per the powertrain control module (PCM), code P2202 will be stored.

What causes this problem with the NOx Sensor Circuit Low Bank 1?

• Some issues related to the air/fuel ratio sensor/oxygen sensor (AFR/O2)
• Malfunctioning mass air flow sensor (MAF)
• NOx sensor not working
• NOx sensor circuit wiring and connector issue
• Imperfect powertrain control module (PCM)

1. Exhaust Gas Recirculation Valve - Did you just see check engine light flashing on your dashboard? If the computer would detect some fault 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.
2. 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!
3. Engine Control Module - Is your car engine light still staying ON after resetting or your car engine is turning off for no reason? Then these are some common symptoms indicating that your car engine control module is defective.
4. Powertrain Control Module - The PCM works as the central computer system in an automobile’s mechanism. This auto part is the in charge of all the constituents as well as the functions performed by them. Having such enormous importance in the operation of all the parts means that any defect in it will affect almost every aspect of a car.
5. Fuel Injector - If there is a leakage in the fuel injectors, then it might cause rise in the fuel consumption, fuel odors around the vehicle and hard starting. You can always rely on us as we have best auto parts for our customers.
6. Electronic Control Unit - The ECU is a major component of your car's onboard computer. It's used to regulate many systems and subsystems in your car's engine, drive train and other major components. Visit us to buy best quality ECU online.
7. Diagnostic Tools - Take help of a professional mechanic to diagnose OBD code error. Use high grade diagnostic tools to resolve this issue. Buy new tools and equipment form us!
8. Fluid Pump - The fluid pump is usually located in the cover of the transmission. It draws fluid from a pump in the bottom of the transmission and feeds it to the hydraulic system. It also feeds the transmission cooler and the torque converter. Thus, replace faulty fluid pump now!
9. Engine Coolant Temperature Sensor - Did you just see black smoke coming out from your vehicle’s exhaust? Black smoke is an indication that you should not drive your vehicle as there might be some fault in the engine coolant temperature sensor. Buy engine coolant temperature sensor from us online at affordable prices.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P2202 here:

Common Symptoms

• Reduced/abnormal engine performance
• Affected fuel efficiency
• Engine Misfire codes stored
• Fuel smell
• Increased exhaust emission
• Reduced acceleration and throttle response

We have listed out some ways which would help you to correct the occurrence of OBD Code P2202. They are mentioned here as follows:

• It is essential to restore the flawed NOx sensor control circuit
• Repair or replace the quirky engine control module
• Rehabilitate the defaults in the NOx sensor
• Carefully adjust the faults in the SCR controller/PCM or programming error
• Recondition the non-functioning electronic control unit

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, Nox Sensor, Reductant Tank, Nox Module and a lot more. We are sure that now all your issues would be resolved.

Here are some steps which you should follow in order to diagnose this fault code:

• First of all, a mechanic should start by connecting a scan tool to retrieve any codes. This error code is generally set with other associated codes which should be addressed first.
• Now if you find out that this is the only code, then the mechanic should start by checking all the relevant scan tool data for the hints of the issues, in particular the LTFT.
• The fuel trims are generally the values which are calculated by the powertrain control module which are utilized for the diagnosis purposes. A 0% trim specifies no correction is required and optimum fuel mixtures.
• Negative trim percentages would specify that the PCM is reducing the amount of fuel while positive percentages indicate the PCM is increasing the amount of fuel injected into the motor. Valuable diagnostic data is provided by the fuel trims.
• They will often direct the mechanic where they should actually look first. After that the O2 sensor should be tested as the O2 is the primary sensor to determine the fuel mixture in the combustion chamber.
• The data of the O2 sensor should be fluctuating from 0.1 volts to 0.9 volts rapidly. If you find out that it is not fluctuating rapidly, then propane should be injected into the intake manifold while monitoring O2 sensor data on a scan tool as it would decide if the O2 is functioning.
• When the propane is introduced, then it should respond very quickly. If it is not doing so, then you must replace it. Now once it has been determined that the O2 sensor is working in the right manner, then the interpretation of the fuel trims will often lead the mechanic in the right direction.
• Some of those directions would incorporate pinpoint tests of the MAF (Mass Air Flow) sensor and or MAP (Manifold Absolute Pressure) sensor. This should be done while examining the fuel pressure. Fuel pressure specifications, MAP, and MAF sensor specifications would depend upon the individual manufacturers and should be referenced with a professional automotive information system.
• Also check for the problems in the NOx sensor and circuit and replace the faulty parts immediately.
• When you are inspecting the fuel pressure, it is important to turn the motor off and observe how long it takes for the pressure to bleed off. A fuel system in good operating order shouldn’t bleed off at all.
• Bleed off only becomes an issue if it bleeds off quickly. Dropping no more than a few pounds in five minutes is acceptable. Rapid bleed off would indicate a leakage in the fuel pressure that could be adding more fuel than expected to the combustion chamber. If this is the case, pinching off of fuel hoses to find the leak is vital.

Common Mistakes When Diagnosing the P2202 Code

• It is very important to clear the memory of the ECM codes before you start examining the freeze frame data for the main issue, so the failure might be identical and restored.
• Most of the times mechanics fail to clear the codes of the engine control module once the codes are fixed.
• Many a times the mechanics might simply replace the NOx sensor; while in reality there can be just a need to repair the damaged connector.