What Does P2208 Mean?
The PCM has detected a malfunction in the NOx sensor heater sense circuit on Bank 1. This circuit monitors heater operation and temperature to ensure proper sensor function.
Common Causes
35%
Failed NOx sensor with internal heater sense circuit fault
25%
Open or shorted heater sense wire in harness
20%
Corroded or damaged sensor connector terminals
12%
Damaged heater sense circuit ground
8%
PCM internal fault in sense circuit monitoring
Diagnostic Steps
1
Step 1: Inspect NOx sensor connector for corrosion, water intrusion, or damaged pins
2
Step 2: Check continuity and resistance of heater sense circuit wiring from sensor to PCM
3
Step 3: Verify proper ground circuit integrity for sense circuit
4
Step 4: Monitor heater sense circuit voltage during sensor warm-up cycle
5
Step 5: If all wiring checks good, replace NOx sensor and verify repair
Estimated Repair Cost
$200 - $950
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the NOx sensor heater sense circuit on Bank 1. This circuit monitors heater operation and temperature to ensure proper sensor function.
The most common cause of P2208 (NOx Sensor Heater Sense Circuit Bank 1) is: Failed NOx sensor with internal heater sense circuit fault
Typical repair costs for P2208 range from $200 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but PCM cannot properly monitor heater operation, potentially leading to inaccurate emissions readings and failed emissions tests.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2208 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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