O2 Sensor Out of Range During Deceleration Bank 2 Sensor 1
The P2298 code indicates that the oxygen sensor (O2S) on Bank 2, Sensor 1 (upstream of the catalytic converter) is reporting a voltage or signal that is outside the expected range during deceleration. This typically occurs when the sensor fails to switch properly between rich and lean conditions, often due to contamination, aging, or wiring issues. The PCM monitors the sensor's response time and voltage levels; when deceleration fuel cut-off occurs, the sensor should quickly indicate a lean condition. If it remains stuck or responds slowly, the code sets.
01. Most Common Causes
- Faulty oxygen sensor (Bank 2 Sensor 1)
- Exhaust leak upstream of the sensor
- Wiring or connector issues (corrosion, damage)
- Engine vacuum leak
- Fuel pressure or injector problems
02. Symptoms You Will Notice
- Check Engine Light on
- Poor fuel economy
- Rough idle or hesitation during deceleration
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect O2 sensor wiring and connectors for damage or corrosion.
Step 3: Check for exhaust leaks upstream of Bank 2 Sensor 1.
Step 4: Use a scan tool to monitor O2 sensor voltage during deceleration; should drop below 0.2V.
Step 5: If sensor response is slow or stuck, replace the oxygen sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause reduced fuel economy and increased emissions. Prolonged driving could damage the catalytic converter.
How much does it cost to fix?▼
Typically $50-$150 for a DIY replacement of the oxygen sensor; labor costs extra if done by a shop.