What Does P2200 Mean?
The NOx (Nitrogen Oxide) sensor circuit on Bank 1 has a malfunction preventing proper signal communication with the PCM. This sensor monitors NOx levels in the exhaust for emissions control and SCR system operation in diesel engines.
Common Causes
35%
Faulty NOx sensor on Bank 1
30%
Damaged wiring harness or corroded connector to NOx sensor
15%
Poor ground connection for NOx sensor circuit
12%
PCM software issue or internal PCM fault
8%
Exhaust leaks near NOx sensor affecting readings
Diagnostic Steps
1
Step 1: Visually inspect NOx sensor wiring harness and connector for damage, corrosion, or loose connections
2
Step 2: Check voltage supply and ground circuits to NOx sensor using multimeter per manufacturer specifications
3
Step 3: Monitor NOx sensor data using scan tool to verify sensor is responding to exhaust conditions
4
Step 4: Check for exhaust leaks near sensor mounting location
5
Step 5: Test NOx sensor resistance and heater circuit operation; replace sensor if out of specification
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The NOx (Nitrogen Oxide) sensor circuit on Bank 1 has a malfunction preventing proper signal communication with the PCM. This sensor monitors NOx levels in the exhaust for emissions control and SCR system operation in diesel engines.
The most common cause of P2200 (NOx Sensor Circuit Bank 1) is: Faulty NOx sensor on Bank 1
Typical repair costs for P2200 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but emissions will increase and may fail emissions testing. Diesel vehicles may enter derate mode or limit performance if not repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2200 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control / SCR System
Difficulty
Type
Generic (SAE)
Recommended Tools
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