What Does P2204 Mean?
The PCM has detected an intermittent signal from the NOx (nitrogen oxide) sensor on Bank 1. This indicates an unreliable or sporadic communication between the sensor and the control module, often caused by poor connections or a failing sensor.
Common Causes
35%
Corroded, loose, or damaged wiring connector at NOx sensor
30%
Intermittent internal failure of NOx sensor
20%
Damaged or chafed wiring harness between sensor and PCM
10%
Poor ground connection in NOx sensor circuit
5%
PCM internal fault or software issue
Diagnostic Steps
1
Step 1: Perform a thorough visual inspection of NOx sensor connector and wiring for corrosion, damage, or looseness
2
Step 2: Monitor live data for NOx sensor voltage/signal while wiggling harness and connectors to reproduce intermittent fault
3
Step 3: Check resistance and continuity of all NOx sensor circuits from sensor to PCM
4
Step 4: Verify proper ground circuit integrity with voltage drop test
5
Step 5: If wiring is intact, replace NOx sensor and retest
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an intermittent signal from the NOx (nitrogen oxide) sensor on Bank 1. This indicates an unreliable or sporadic communication between the sensor and the control module, often caused by poor connections or a failing sensor.
The most common cause of P2204 (NOx Sensor Circuit Intermittent Bank 1) is: Corroded, loose, or damaged wiring connector at NOx sensor
Typical repair costs for P2204 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced fuel economy and increased emissions. Extended driving may cause catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2204 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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