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AutoCodes – Generic – P220A

P220A Code - NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1

Quick Answer

This fault code is stored when a malfunction is detected with the NOx Sensor circuit. Common causes include Faulty NOx Sensor, NOx Sensor harness is open or shorted, NOx Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P220A indicates NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1.
Common causes
Common causes include Faulty NOx Sensor, NOx Sensor harness is open or shorted, NOx Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 6,924
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Jul 09, 2020
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Code P220A Description

This fault code is stored when a malfunction is detected with the NOx Sensor circuit. Some lean burn and direct injection vehicles will use a Selective Catalytic Reduction System (SCR), which uses a NOx accumulator to store oxides of Nitrogen and allows them to be reduced at a suitable time. A NOx sensor is used to detect when a regeneration is required and when the regeneration is complete. The NOx sensor will have a module located close to the sensor which communicates with the engine control module. A heater circuit is required to get the NOx sensor up to operating temperature quickly to allow for reliable performance in a timely manner.
OBDII Code P220A - NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1 - AutoCodes.com
P220A Code - NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1
What does this mean?

What are the Possible Causes of the DTC P220A?

  • Faulty NOx Sensor
  • NOx Sensor harness is open or shorted
  • NOx Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P220A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P220A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P220A code?

Need more information on how to fix the P220A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P220A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P220A Code

1. What does the OBDII code P220A mean?

P220A indicates an issue with the NOx sensor supply voltage circuit for Bank 1 Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of code P220A?

Symptoms may include the check engine light turning on, reduced fuel efficiency, increased emissions, or the vehicle entering limp mode.

3. What causes the P220A code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or issues with the engine control module (ECM).

4. How is the P220A code diagnosed?

Technicians check the sensor wiring and connectors for damage, test the NOx sensor’s voltage supply, inspect related fuses, and use a scan tool to monitor live data.

5. Can I drive with the P220A code active?

Driving with this code is not recommended, as it may lead to increased emissions, poor performance, or damage to the catalytic converter over time.

6. How do I fix the P220A code?

Repairs may involve replacing the NOx sensor, repairing damaged wiring, replacing a blown fuse, or reprogramming/updating the ECM if necessary.

7. How much does it cost to fix the P220A code?

Repair costs can range from $200 to $700, depending on whether the NOx sensor, wiring, or other components need replacement.

8. Can a dirty NOx sensor cause the P220A code?

Yes, a contaminated or malfunctioning NOx sensor can result in incorrect readings and trigger the P220A code.

9. Can I reset the P220A code without repairs?

You can clear the code with an OBDII scanner, but if the underlying issue is not resolved, the code will likely return.

10. Is the P220A code related to emissions testing?

Yes, the P220A code affects the NOx sensor, which plays a key role in emissions control. This code may cause your vehicle to fail an emissions test.

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