P2223 Fault Code

NOx Sensor Heater Sense Circuit Low Bank 2

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2223 fault code indicates an issue with the NOx (Nitrogen Oxide) sensor heater sense circuit in Bank 2 of the vehicle's engine. This sensor is critical for monitoring the level of nitrogen oxides in the exhaust gases, helping to reduce emissions by ensuring efficient combustion. When the heater circuit for this sensor is reported as low, it may affect the overall performance of the emissions control system, leading to increased pollutants being released into the atmosphere.

What are the symptoms of the P2223 code?

Drivers may notice various symptoms when this fault code is triggered, such as:

• Illumination of the check engine light on the dashboard
• Increased emissions during an emissions test
• Reduced engine performance or power

What causes the P2223 code?

A low signal in the NOx sensor heater circuit can be caused by several factors, including:

• Faulty NOx sensor itself
• Damaged wiring or connectors leading to the sensor
• A blown fuse that supplies power to the heater circuit
• Issues with the engine control unit (ECU) detecting the sensor's input signals

How to fix P2223?

To resolve the P2223 fault code, consider the following steps:

• Inspect the NOx sensor and its wiring for any signs of damage, corrosion, or disconnection.
• Test the NOx sensor to determine if it's functioning properly. If it's faulty, replace it.
• Check for and replace any blown fuses related to the heater circuit.
• Ensure that the ECU is receiving and processing signals correctly; if needed, reprogram or replace the ECU.