AutoCodes – Mercedes-Benz – P220A Mercedes-Benz

P220A Mercedes-Benz 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 Mercedes-Benz 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 6,794

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P220A Mercedes-Benz 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 Mercedes-Benz - NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1 - AutoCodes.com — P220A Mercedes-Benz Code - NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P220A Mercedes-Benz?

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 Mercedes-Benz?

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 Mercedes-Benz 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 Mercedes-Benz code?

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

Need Help with the Code?

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

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 Mercedes-Benz Code

1. What does the OBDII code P220A for a Mercedes-Benz NOx Sensor Supply Voltage Circuit Bank 1 Sensor 1 mean?

This code indicates a problem with the supply voltage circuit for the NOx (nitrogen oxide) sensor located in Bank 1 Sensor 1 of the vehicle.

2. What are some common symptoms of a P220A fault in a Mercedes-Benz?

Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the Check Engine light on the dashboard.

3. What are potential causes of the P220A code in a Mercedes-Benz?

Possible causes of this code include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's power supply to the sensor.

4. How can I diagnose a P220A fault in my Mercedes-Benz?

Diagnosing a P220A fault typically involves using an OBDII scanner to retrieve the specific code, inspecting the NOx sensor and its wiring for damage, and testing the sensor's voltage supply.

5. Can I continue driving my Mercedes-Benz with a P220A fault code?

It is not recommended to drive your vehicle with a P220A fault, as it can lead to further damage and potential safety risks. It is best to address the issue promptly.

6. How can I repair a P220A fault in my Mercedes-Benz?

Repairing a P220A fault may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, and ensuring proper voltage supply to the sensor.

7. Is the NOx sensor supply voltage circuit a critical component in a Mercedes-Benz?

Yes, the NOx sensor supply voltage circuit is a critical component as it helps monitor and control the vehicle's emissions, ensuring compliance with environmental regulations.

8. Can a P220A fault affect the emissions output of my Mercedes-Benz?

Yes, a P220A fault can affect the emissions output of your vehicle by causing improper monitoring and control of nitrogen oxide levels, potentially leading to increased emissions.

9. How much does it typically cost to repair a P220A fault in a Mercedes-Benz?

The cost of repairing a P220A fault can vary depending on the specific issue, the need for parts replacement, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

10. Are there any preventative maintenance steps to avoid a P220A fault in a Mercedes-Benz?

Regular vehicle maintenance, such as checking and replacing sensors as recommended by the manufacturer, can help prevent issues like a P220A fault from occurring.