P2216 Fault Code

NOx Sensor Circuit High Bank 2

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

The P2216 fault code indicates an issue with the NOx (Nitrogen Oxide) sensor circuit on Bank 2 of a vehicle's engine. This system plays a crucial role in reducing emissions by monitoring nitrogen oxide levels in the exhaust. If the circuit is deemed 'high', it suggests abnormal readings from the sensor, potentially impacting emissions control and engine performance.

What are the symptoms of the P2216 code?

Common symptoms associated with a P2216 code include:

• Illuminated check engine light on the dashboard.
• Decreased engine performance or power loss during acceleration.
• Increased exhaust emissions, potentially leading to failing emissions tests.
• Random stalling or rough engine idle as the vehicle's engine management system reacts to faulty readings.

What causes the P2216 code?

Several factors can contribute to a P2216 code, including:

• A malfunctioning NOx sensor that is unable to regulate or communicate correct data.
• Damaged wiring or connectors in the NOx sensor circuit, leading to high resistance or poor connections.
• Issues with the engine control module (ECM) affecting sensor readings.
• Exhaust leaks that may alter the NOx levels detected by the sensor.

How to fix P2216?

To address a P2216 fault code, follow these steps:

• Inspect the NOx sensor and its connections for any visible damage or corrosion.
• Use a multimeter to check the sensor's voltage and resistance; replace the sensor if it’s outside specification.
• Examine the wiring harness for cuts, breaks, or frays, and repair or replace as necessary.
• Ensure the exhaust system is leak-free; seal any leaks found.
• Clear the fault code and conduct a test drive to verify that the issue has been resolved.