What Does P2225 Mean?
The NOx sensor heater circuit on Bank 2 is experiencing intermittent operation. This affects the sensor's ability to reach proper operating temperature for accurate emissions monitoring.
Common Causes
35%
Damaged or corroded wiring harness and connectors to NOx sensor
30%
Faulty NOx sensor heater element internal failure
20%
Intermittent power supply or ground circuit issue
10%
PCM/ECM internal driver circuit malfunction
5%
Exhaust leaks near sensor causing thermal stress
Diagnostic Steps
1
Step 1: Inspect NOx sensor connector and wiring for damage, corrosion, or loose connections while wiggling harness
2
Step 2: Monitor NOx sensor heater circuit voltage and amperage with scan tool during operation to identify intermittent behavior
3
Step 3: Measure resistance of NOx sensor heater element (typically 2-10 ohms when cold)
4
Step 4: Check power and ground circuits to sensor with multimeter during key-on and engine running
5
Step 5: If all circuits test normal, replace NOx sensor and retest
Estimated Repair Cost
$400 - $1,200
Parts + labor, varies by vehicle and location
The NOx sensor heater circuit on Bank 2 is experiencing intermittent operation. This affects the sensor's ability to reach proper operating temperature for accurate emissions monitoring.
The most common cause of P2225 (NOx Sensor Heater Sense Circuit Intermittent Bank 2) is: Damaged or corroded wiring harness and connectors to NOx sensor
Typical repair costs for P2225 range from $400 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 performance is degraded. May result in failed emissions testing and reduced fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2225 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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