The P2206: NOx Sensor Heater Control Circuit Low Bank 1 refers to a condition where the voltage in the NOx sensor heater control circuit of bank 1 is lower than expected. This could be caused by a faulty NOx sensor heater, wiring issues, or connector problems, resulting in insufficient power for the heater to operate effectively.
P2206 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2206: NOx Sensor Heater Control Circuit Low Bank 1 |
| Is it serious? | Yes, the NOx sensor may not reach optimal operating temperature, leading to inaccurate NOx readings and affecting emissions control. |
| Possible causes | – Low voltage in NOx sensor heater control circuit in bank 1 – Faulty NOx sensor heater or wiring issues – Connector problems |
| How to diagnose? | – Measure voltage in the NOx sensor heater control circuit in bank 1 – Test the NOx sensor heater for faults – Inspect wiring and connectors for issues |
P2206 Meaning
The P2206: NOx Sensor Heater Control Circuit Low Bank 1 code indicates that the engine control module (ECM) has detected a lower-than-expected voltage in the NOx sensor heater control circuit for bank 1 (the side of the engine containing cylinder 1). The heater ensures the NOx sensor reaches operating temperature quickly, enabling it to accurately measure nitrogen oxide (NOx) emissions. A low voltage issue can prevent the heater from working properly, resulting in inefficient NOx monitoring and emissions control.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any related codes that may provide additional insight into the NOx sensor or heater circuit. | OBD-II Scanner |
| Measure Voltage in NOx Sensor Heater Control Circuit | Use a multimeter to measure the voltage in the NOx sensor heater control circuit in bank 1. Ensure the voltage is within the manufacturer’s specifications. | Multimeter, Vehicle Manual |
| Test the NOx Sensor Heater | Use a diagnostic tool or multimeter to test the NOx sensor heater for proper operation. Compare the sensor’s output to manufacturer specifications to verify functionality. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors for damage, corrosion, or loose connections that may cause low voltage in the heater control circuit. | Flashlight, Safety Gloves |
| Check Sensor Circuit Continuity | Test for continuity in the NOx sensor heater control circuit to ensure proper current flow. Low voltage may result from resistance in the wiring or poor connections. | Multimeter, Wiring Diagram |
| Repair or Replace Faulty Components | If any wiring, connectors, or the NOx sensor heater are found to be faulty, repair or replace them to restore the proper voltage to the circuit. | Replacement Parts, Tools |
| Clear the Code and Test Drive | After repairs, clear the P2206 code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner |
| Recheck for Codes | After the test drive, re-scan the vehicle to confirm that the P2206 code does not return. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)