O2 Sensor Exhaust Sample Error Bank 2 Sensor 1
The P2415 code indicates that the Engine Control Module (ECM) has detected an error in the exhaust gas sample from the Bank 2 Sensor 1 oxygen sensor. This sensor is located upstream of the catalytic converter on the side of the engine opposite cylinder #1. The ECM monitors the sensor's response time and signal range; if the sensor fails to switch properly or its signal is out of expected parameters, this code sets. Common causes include a faulty oxygen sensor, exhaust leaks, wiring issues, or contamination from oil or coolant.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Exhaust leak before the sensor
- Wiring or connector damage
- Contaminated sensor (oil, coolant, fuel additives)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and freeze frame data to confirm P2415.
Step 2: Visually inspect O2 sensor wiring and connector for damage.
Step 3: Check for exhaust leaks near Bank 2 Sensor 1 using a smoke machine or soapy water.
Step 4: Test sensor signal with a multimeter or oscilloscope; compare to manufacturer specs.
Step 5: If sensor fails, replace Bank 2 Sensor 1 and clear codes.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause poor performance and increased emissions. Prolonged driving could damage the catalytic converter.
How much does it cost to fix?▼
Replacing the oxygen sensor typically costs $150-$300 including parts and labor. Diagnosis may add $50-$100.