NOx Sensor Circuit Intermittent Bank 2
The P2217 code indicates an intermittent fault in the NOx sensor circuit for Bank 2 (the side of the engine not containing cylinder #1). The NOx sensor measures nitrogen oxide levels in the exhaust to help the diesel or lean-burn gasoline engine control system optimize emissions. An intermittent signal suggests a loose connection, damaged wiring, or a failing sensor that may cause the engine control module (ECM) to receive erratic readings, potentially affecting emissions and fuel trim.
01. Most Common Causes
- Loose or corroded connector at the NOx sensor
- Damaged wiring or short circuit in the sensor circuit
- Faulty NOx sensor (Bank 2)
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible reduced fuel economy
- Possible rough idle or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan the vehicle for codes and record freeze frame data.
Step 2: Visually inspect the NOx sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Check sensor resistance and voltage with a multimeter per manufacturer specs.
Step 4: If wiring is intact, replace the NOx sensor on Bank 2.
Step 5: Clear codes and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and reduced fuel economy. Prolonged driving could lead to other issues if the sensor fails completely.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Replacing the NOx sensor can range from $200-$600 including parts and labor, depending on vehicle make and model.