P2219 Fault Code

NOx Sensor Heater Control Circuit Low Bank 2

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

The P2219 fault code indicates an issue with the NOx sensor heater control circuit for bank 2. This code is particularly critical as it relates to the vehicle's emissions control system, impacting how pollutants are managed. A functioning NOx sensor is essential for monitoring nitrogen oxide levels, and any malfunction can lead to increased emissions and potential legal issues regarding environmental regulations.

What are the symptoms of the P2219 code?

Symptoms that may indicate the presence of the P2219 code include:

• Check Engine Light illuminated on the dashboard.
• Increased emissions readings during inspections.
• Decreased fuel efficiency, potentially due to improper air-fuel mixture adjustments.
• Possible rough idling or engine stalling due to the engine management system trying to compensate for the faulty readings.

What causes the P2219 code?

Common causes for the P2219 error include:

• Faulty NOx sensor heater.
• Wiring issues such as breaks or corrosion in the heater control circuit.
• Malfunctioning Engine Control Unit (ECU) that fails to provide the correct voltage.
• Poor vehicle grounding that affects electrical circuits.
• Poor connections at the NOx sensor connector leading to signal failures.

How to fix P2219?

To resolve the P2219 code, the following steps are typically advised:

• Inspect the NOx sensor heater and associated wiring for damage or wear and replace if necessary.
• Check the electrical connections at the NOx sensor for corrosion or loose connections and clean or repair as needed.
• Test the NOx sensor for proper functionality using a multimeter or diagnostic tool and replace if found defective.
• Ensure proper ground connections are secure to improve electrical signal integrity.
• Clear the fault code after repairs and run a diagnostic test to ensure it does not return.