Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part of the car that helps reduce pollution. It's like a heater that helps a sensor work properly, and it's not working right now.
The NOx sensor measures nitrogen oxide levels in the exhaust to help control emissions. The heater helps the sensor work correctly by keeping it at the right temperature.
P2220 indicates that the NOx sensor heater control circuit on Bank 2 is experiencing a high voltage condition. This could mean that the heater circuit is receiving more voltage than expected, which can affect the sensor's ability to accurately measure NOx levels.
• Check Engine Light is on
• Reduced fuel efficiency
• Increased emissions
• Faulty NOx sensor heater
• Wiring issues such as shorts or open circuits
• Faulty engine control module (ECM)
NOx: Nitrogen Oxides, pollutants produced in combustion processes.
ECM: Engine Control Module, the computer that controls engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the NOx sensor heater circuit for proper voltage and resistance.
• Replace the NOx sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Volkswagen Passat
• Audi A4
• BMW 3 Series
• Regular maintenance checks
• Ensure proper fuel quality
• Timely replacement of sensors
Sensor Issue
• Do not ignore the Check Engine Light.
• Consult a professional mechanic if unsure.
• Avoid driving for long periods with this issue.
Check vehicle warranty as emissions-related components may be covered.
This code has been more prevalent in vehicles with advanced emissions control systems.
Moderate – Addressing this issue promptly can prevent further emissions and potential engine performance issues.
Driving with unresolved emissions issues may violate local emissions laws.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The NOx sensor is typically located in the exhaust system, downstream of the catalytic converter on Bank 2.
Q: Can I drive with a P2220 code?
A: It's not recommended as it may lead to increased emissions and reduced fuel efficiency.
Q: What is NOx?
A: NOx refers to nitrogen oxides, which are harmful pollutants produced during combustion in the engine.
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Universal · Digital multimeter
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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.