Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer detected a problem with the power going to a sensor that helps control pollution from the engine. It's like when a toy doesn't work because the batteries aren't connected properly.
The P220D code indicates an issue with the electrical circuit that supplies voltage to the NOx sensor located on bank 2, sensor 2. This sensor is responsible for measuring nitrogen oxide levels in the exhaust gases.
The NOx sensor is an essential component of the vehicle's emissions control system, specifically designed to measure the concentration of nitrogen oxides in the exhaust gases. Bank 2 refers to the side of the engine opposite cylinder 1. Sensor 2 indicates the downstream sensor, typically located after the catalytic converter. A P220D code suggests that the power supply to this sensor is either too low or too high, which can affect its operation and the vehicle's emissions performance.
• Check Engine Light illuminated
• Increased emissions
• Potential decrease in fuel efficiency
• Faulty NOx sensor
• Damaged wiring or connectors
• Blown fuse or faulty relay
NOx: Nitrogen Oxides, pollutants produced during combustion.
Bank 2: The side of the engine opposite cylinder 1.
Sensor 2: The second sensor in the exhaust stream, usually downstream of the catalytic converter.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Check the fuse and relay associated with the NOx sensor circuit.
• Replace the faulty NOx sensor.
• Repair or replace damaged wiring or connectors.
• Replace any blown fuses or faulty relays.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $500
Moderate
• Volkswagen Passat
• Audi A4
• BMW 3 Series
• Regular maintenance checks
• Ensure proper electrical connections
• Use high-quality fuel to reduce emissions
Sensor Issue
• Get the issue diagnosed and repaired promptly to avoid increased emissions.
• Regularly check and maintain your vehicle's exhaust system.
Check with the manufacturer for specific warranty coverage on emissions-related components.
The P220D code has been more commonly reported in diesel vehicles due to their reliance on NOx sensors for emissions control.
Moderate – It's important to address this issue to ensure your vehicle meets emissions standards and operates efficiently.
Driving with a malfunctioning emissions system may lead to failing emissions tests and can be illegal in some regions.
• Engine at operating temperature
• Vehicle in closed-loop mode
The NOx sensor for bank 2, sensor 2 is typically located downstream of the catalytic converter on the exhaust system, on the side of the engine opposite cylinder 1.
Q: Can I drive with a P220D code?
A: While the car may still be drivable, it's not recommended to ignore this code as it can lead to increased emissions and potential engine performance issues.
Q: How do I reset the Check Engine Light after fixing the P220D code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the light should not return.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.