Technical Description of OBD-II Trouble Code
Range/Performance Issue with NOx Sensor in Bank 2
What does that signify?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles, including those from Ford, Mercedes Benz, BMW, VW, Audi, Chevrolet, GMC, Dodge, Ram, Sprinter, and others. While the exact repair steps may vary depending on the year, make, model, and powertrain configuration, this code is generally related to the emission standards set by state/provincial laws.
In general, diesel-fueled engines produce higher levels of particulate matter (PM) and Nitrogen Oxide (NOx) emissions compared to gasoline engines. To comply with emission requirements, engineers are continuously developing methods to reduce atmospheric emissions in vehicles.
The Engine Control Module (ECM) constantly monitors numerous sensors to ensure the efficiency, reliability, and functionality of the engine. It also actively monitors emissions and aims to minimize the release of hydrocarbons into the atmosphere. The NOx sensor is used by the ECM to measure nitrogen oxide levels in the exhaust, which is a primary component of PM emissions from diesel engines. The ECM adjusts the system based on the readings from this sensor.
It is important to note that the exhaust of a diesel engine can accumulate soot, which can affect sensors and switches in the exhaust system. If the sensor is contaminated, it may not provide accurate measurements required by the ECM to adjust the EVAP system according to federal/state/provincial laws. In some cases, aftermarket sensors are used to meet local emission standards when traveling between states with different regulations.
The ECM triggers the P2214 code and related codes (P2215, P2216, and P2217) when it detects a fault in the NOx sensors or their circuits. Based on limited experience with this code, it is likely to be a mechanical issue, considering the conditions mentioned earlier.
The P2214 code is set when the ECM detects an electrical condition outside the acceptable range in the bank #2 NOx sensor or circuit.
NOTE: The term “bank 2” refers to the side on which the sensor is located in the exhaust system. Refer to the service manual for specific details. The manual provides information to identify the specific sensor among multiple possibilities. Similar distinctions are made for O2 (oxygen) sensors.
Here is an example of a NOx sensor for GM vehicles:
What is the severity of this DTC?
In most cases, emission-related codes have a relatively low severity compared to potential hazards in other vehicle systems such as steering, suspension, and brakes. If you have more pressing issues to address, you can prioritize those over this code. However, any electrical fault should be addressed promptly.
What are some of the symptoms of the code?
Symptoms of a P2214 trouble code may include:
What are some of the common causes of the code?
Possible causes for this P2214 fuel trim code may include:
What are some P2214 troubleshooting steps?
Start by visually inspecting the sensor and its harness. External factors can sometimes cause faults, such as rocks, curbs, snow, and ice damaging sensors. Ensure that the sensor is intact and in good condition. Keep in mind that some harnesses may be located close to the exhaust, so wires can get burnt or melted, leading to various problems.
TIP: Allow the engine to cool before working near the exhaust.
Clean the sensor. Remember that sensors mounted in the exhaust undergo frequent heating and cooling cycles, causing them to expand and contract. This can sometimes cause the sensor to become stuck in the exhaust’s sensor “bung” (thread hole). If this happens, you may need to apply heat to the threads (not directly on the sensor) to loosen it. However, if you are inexperienced with using heat to loosen nuts or bolts, it is advisable to seek assistance from a reputable service station.
