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Engine-Codes – Generic – P2202

P2202 Code - NOx Sensor 1 Circuit Low Voltage

Quick Answer

The P2202 code indicates that there is a low voltage condition in the NOx (Nitrogen Oxide) Sensor 1 circuit. Common causes include Faulty NOx Sensor 1, Wiring or connection issues, Corrosion or damage to sensor components. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2202 indicates NOx Sensor 1 Circuit Low Voltage.
Common causes
Common causes include Faulty NOx Sensor 1, Wiring or connection issues, Corrosion or damage to sensor components.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P2202 Description

The P2202 code indicates that there is a low voltage condition in the NOx (Nitrogen Oxide) Sensor 1 circuit. This sensor is responsible for monitoring the level of nitrogen oxide emissions in the exhaust gases. A low voltage reading suggests that the sensor is not functioning properly, which can lead to inaccurate emissions readings and potentially higher emissions output. This issue can have a negative impact on the vehicle's fuel efficiency, emissions output, and overall performance. If left unaddressed, it may also cause damage to other components in the emissions control system.

OBDII Code P2202 - NOx Sensor 1 Circuit Low Voltage
P2202 Code - NOx Sensor 1 Circuit Low Voltage

Common Causes of P2202

  1. Faulty NOx Sensor 1
  2. Wiring or connection issues
  3. Corrosion or damage to sensor components
  4. Exhaust leaks
  5. Issues with the engine control module (ECM)

Symptoms of P2202

  1. Check Engine Light illuminated
  2. Decreased fuel efficiency
  3. Poor engine performance
  4. Failed emissions test
  5. Rough idling or stalling

How to Fix P2202

  1. Diagnose the issue using a scan tool to confirm the P2202 code and pinpoint the specific cause.
  2. Inspect the wiring and connections to the NOx Sensor 1 for any damage or corrosion.
  3. Test the sensor's voltage output and resistance to determine if it is functioning properly.
  4. Replace the NOx Sensor 1 if it is found to be faulty.
  5. Clear the code and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2202

The cost of repairing a NOx Sensor 1 circuit low voltage issue can vary depending on the make and model of the vehicle, as well as the specific cause of the problem. On average, the cost of replacing a NOx sensor can range from $200 to $500, including parts and labor. Additional costs may apply if there are other underlying issues contributing to the problem. It's recommended to consult with a professional mechanic to get an accurate estimate for your specific vehicle.

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Code P2202 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 P2202 Code

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  • 2012 GMC 2500HD Duramax, it threw out P2202 after it stalled when I did a remote start on a cold (-3'F) morning. Text on the dash states that it will limit power in 175 miles. Two days later checked codes again and now it was showing two codes P2200 &P2202. I had been doing a lot of slow driving and using the remote start alot before this happened. Thinking that it's just particular matter built up. So I started driving harder - high speeds, fast acceleration, etc. The Check Engine light went out. It seems to be back to normal now except for the text telling me that it will limit power in 142 miles... The DEF fluid was "normal" before all this happened....I don't suspect anything there. I'll take it in to the shop to get the text cleared and find out more. If I can find my way back here, I'll update this.

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