P2225 NOx Sensor Heater Sensor Circuit Intermittent Bank 2

P2225 NOx Sensor Heater Sensor Circuit Intermittent Bank 2

OBD-II DTC Datasheet

NOx Sensor Heater Sensor Circuit Intermittent Bank 2

What does this mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. Car brands may include, but are not limited to, Mercedes-Benz, Sprinter, VW, Audi, Ford, Dodge, Ram, Jeep, etc.

NOx (nitrogen oxide) sensors are mainly used for emission systems in diesel engines. Their main purpose is to determine the levels of NOx coming out of the exhaust gases after combustion in the combustion chamber. The system then processes them using different methods. Given the harsh operating conditions of these sensors, they are made up of a combination of ceramic and a specific type of zirconia.

One of the disadvantages of NOx emissions to the atmosphere is that they can sometimes cause smog and / or acid rain. Failure to adequately control and regulate NOx levels will result in significant impacts on the atmosphere around us and the air we breathe. The ECM (Engine Control Module) constantly monitors the NOx sensors to ensure acceptable levels of emissions in your vehicle's exhaust gases.

The engine control module (ECM) can calculate nitrogen oxide and nitrogen dioxide (NOx) gases using data received from the vehicle's upstream and downstream oxygen sensors in combination with NOx sensor readings. The ECM does this to regulate the levels of NOx coming out of the tailpipe for environmental emission reasons. Bank 2 mentioned in the trouble codes is an engine block that does not contain cylinder #1.

P2225 is a code described as NOx Sensor Heater Sensor Circuit Intermittent Bank 2, which means that the ECM has detected inconsistencies in the overall performance of the NOx Sensor Heater Sensor Circuit.

Diesel engines especially generate significant amounts of heat, so be sure to let the system cool down before working on any exhaust system components.

Example of a NOx sensor (in this case for GM vehicles):

What is the severity of this DTC?

If the DTCs are ignored and no repair action has been taken, it can lead to catalytic converter failure. Leaving the symptoms and causes of these DTCs unaddressed can lead to further complications for your vehicle, such as constant stopping and reduced fuel consumption. If you notice any of the potential symptoms in the list below, it is highly recommended that you get it checked by a professional.

What are some of the symptoms of the code?

Symptoms of a P2225 diagnostic code may include:

• Periodic stop
• Engine does not start when hot
• Decreased engine performance
• There may be hiss and / or vibrations when accelerating.
• The engine can run lean or rich exclusively on shore # 2.

What are some of the common causes for the code?

Reasons for this NOx sensor code P2225 may include:

• Catalytic converter defective
• Incorrect fuel mixture
• Defective coolant temperature sensor
• Manifold air pressure sensor broken
• There are problems with the mass air flow sensor
• Fuel injection part defective
• The fuel pressure regulator is broken
• There were misfires
• There are leaks from the exhaust manifold, whip hose, downpipe, or some other component of the exhaust system.
• Broken oxygen sensors

What are some of the steps to troubleshoot a P2225?

The first step in the process of troubleshooting any problem is to review technical service bulletins (TSBs) for known problems with a particular vehicle.

Advanced diagnostic steps become very vehicle specific and may require appropriate advanced equipment and knowledge to be performed accurately. We outline the basic steps below, but refer to your vehicle / make / model / transmission repair manual for specific steps for your vehicle.

Basic step # 1

The first step should always be to clear the codes and rescan the vehicle. If none of the DTCs (Diagnostic Trouble Codes) appear immediately as active, take a long test drive with several stops to see if they appear again. If the ECM (engine control module) reactivates only one of the codes, continue diagnostics for that particular code.

Basic step # 2

Then you should check the exhaust for leaks. Black soot around cracks and/or system gaskets is a good sign of a leak. This should be dealt with accordingly, in most cases the exhaust gasket is fairly easy to replace. A fully sealed exhaust is an integral part of the sensors involved in your exhaust system.

Basic step # 3

With an infrared thermometer, you can monitor the temperature of the exhaust gases before and after the catalytic converter. You will then need to compare the results with the manufacturer's specifications, so refer to your specific service manual for that.

Basic step # 4

If the temperature of the catalytic converter is within specifications, pay attention to the electrical system associated with these sensors. Start with the wire harness and the bank 2 NOx sensor connector. Often these belts have a tendency to crack and fail due to close proximity to extreme exhaust temperatures. Repair damaged wires by soldering the connections and shrinking them. Also check the oxygen sensors used in Bank 2 to ensure they are not damaged, which could potentially alter the downstream NOx reading. Repair any connector that does not make enough connections or does not lock properly.

This article is for informational purposes only and technical data and service bulletins for your specific vehicle should always take priority.

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