P2206 Fault Code

NOx Sensor Heater Control Circuit Low Bank 1

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

The P2206 fault code refers to an issue with the NOx sensor heater control circuit, specifically indicating that the heater circuit for Bank 1 is operating below the manufacturer's specified threshold. This sensor plays a crucial role in reducing emissions by monitoring nitrogen oxide levels in the exhaust system. If the heater circuit is low, it can hinder the sensor's ability to properly function, affecting the vehicle’s overall performance and emissions control.

• The NOx sensor is vital for engine management and exhaust emission reduction.
• A low control circuit can trigger the check engine light and may lead to increased emissions.
• It’s essential to address this issue promptly to maintain compliance with emissions regulations.

What are the symptoms of the P2206 code?

When the P2206 code is present, drivers may experience:

• Poor engine performance, especially under load.
• Increased fuel consumption due to improper sensor readings.
• An illuminated check engine light.
• Potential failure to meet emissions testing requirements.
• Unusual exhaust odors or visible smoke from the exhaust pipe.

What causes the P2206 code?

Several factors can contribute to a low NOx sensor heater control circuit:

• A malfunctioning or shorted NOx sensor heater.
• Damaged wiring or poor connections within the circuit.
• Blown fuses that affect the circuit's supply voltage.
• Corrosion or contamination in the sensor connector.
• Software issues in the engine control module (ECM).

How to fix P2206?

To resolve the P2206 fault code, consider the following steps:

• Inspect the NOx sensor and its wiring for damage or corrosion.
• Check connectors for secure connections and clean any debris.
• Test the NOx sensor heater to confirm it is functioning correctly.
• Replace the NOx sensor if it is found to be faulty.
• Replace any blown fuses related to the NOx heater circuit.
• Clear the code and conduct a test drive to ensure the issue is resolved.