P2225 NOx Sensor Heater Sense Circuit Intermittent Bank 2 Trouble Code

P2225 NOx Sensor Heater Sense Circuit Intermittent Bank 2

OBD-II Trouble Code Technical Description

NOx Sensor Heater Sense Circuit Intermittent Bank 2

What does that mean?

This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles. Vehicle makes may include but aren't limited to Mercedes-Benz, Sprinter, VW, Audi, Ford, Dodge, Ram, Jeep, etc.

 

NOx (Oxides of Nitrogen) sensors are primarily used for the emission systems in diesel engines. Their primary use is to detect NOx levels coming out of the exhaust after burning in the combustion chamber. The system then recycles these using different methods. Given the harsh environment of these sensors, they are composed of a combination of ceramic and a certain type of zirconia.

One of the downfalls of emitting NOx into the atmosphere is that it may cause smog and/or acid rain at times. Failure to sufficiently monitor and adjust NOx levels would result in a significant effect to the atmosphere around us and the air we breathe. The ECM (Engine control module) continuously monitors the NOx sensors to ensure acceptable emissions levels in your vehicle's exhaust.

The engine control module (ECM) is able to calculate the Nitric Oxide and Nitrogen Dioxide gases (NOx) by using the data gained from the upstream and downstream oxygen sensors of the vehicle combined with the NOx sensor readings. The ECM does this to regulate the NOx levels coming out of your tailpipe for environmental emission reasons. The Bank 2 referred in the trouble codes is the engine bank that does not contain the #1 cylinder.

P2225 is the code described as "NOx Sensor Heater Sense Circuit Intermittent Bank 2" which means that the ECM has found inconsistencies in the overall performance of the NOx sensor heater sense circuit.

Diesel engines especially produce a significant amount of heat so make sure to always let the system cool before working on any exhaust system components.

An example of NOx sensor (in this case, for GM vehicles):

What is the severity of this DTC?

If the trouble codes are ignored and that there weren't any action made to repair it could lead to catalytic converter failure. If the symptoms and causes of these trouble codes are left unattended, it could lead to further complications for your car such as consistent stalling and reduced fuel economy. If you notice any of the potential symptoms in the list below, it is highly recommended to have it checked by a professional.

What are some of the symptoms of the code?

Symptoms of a P2225 diagnostic code may include:

Intermittent stalling The engine fails to start when warm Decreased performance of the engine When accelerating, there may be a hissing and/or hesitation The engine might run lean or rich on bank #2 exclusively

What are some of the common causes of the code?

Causes for this P2225 NOx sensor code may include:

Catalytic converter is malfunctioning Incorrect fuel mixture The coolant temperature sensor is faulty The manifold air pressure sensor is broken There are problems with the mass air inflow sensor The fuel injection part is defective The fuel pressure regulator is broken There were ignition misfires There are leaks from the exhaust manifold, flex hose, down pipe, or some other exhaust component Broken oxygen sensors

What are some P2225 diagnostic and troubleshooting steps?

The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle.

Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle.

Basic Ste

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