What Does P2202 Mean?
The NOx sensor circuit on Bank 1 is reading voltage or signal values that are too low compared to expected parameters. This indicates either a sensor fault, wiring issue, or a condition causing abnormally low NOx readings.
Common Causes
30%
Short to ground in NOx sensor wiring or connector
30%
Failed NOx sensor with internal short on Bank 1
20%
Corroded or damaged sensor connector causing poor contact
12%
PCM internal fault on NOx sensor input circuit
8%
Sensor heater circuit failure causing low readings
Diagnostic Steps
1
Step 1: Inspect NOx sensor connector for corrosion, moisture, or damaged pins
2
Step 2: Using multimeter, check for short to ground on signal wires with sensor disconnected
3
Step 3: Measure voltage supply to NOx sensor per manufacturer specifications
4
Step 4: Test NOx sensor heater circuit resistance and operation
5
Step 5: Replace NOx sensor if all wiring and circuits test normal; verify repair with test drive and monitor live data
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The NOx sensor circuit on Bank 1 is reading voltage or signal values that are too low compared to expected parameters. This indicates either a sensor fault, wiring issue, or a condition causing abnormally low NOx readings.
The most common cause of P2202 (NOx Sensor Circuit Low Bank 1) is: Short to ground in NOx sensor wiring or connector
Typical repair costs for P2202 range from $250 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. Diesel vehicles may experience reduced power or speed limitations if fault persists.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2202 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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