P013D
O2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 2
Oxygen sensor / emissions
Generic OBD-II
Medium
What it means
P013D means the downstream oxygen sensor on bank 2 (sensor 2, after the catalytic converter) is switching from lean to rich more slowly than the ECM expects. This sensor mainly checks converter performance, so the car usually drives fine, but the code often points to an aging sensor or an exhaust leak and can cause an emissions-test failure.
Medium
Can I keep driving? Safe to drive — this is a downstream oxygen-sensor response fault; the car runs normally but may fail an emissions test until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Slightly reduced fuel economy
- May fail an emissions/readiness test
Common causes
Most likely first
- Aged or contaminated downstream O2 sensor (bank 2, sensor 2)Likely
- Exhaust leak near the sensor skewing its readingsCommon
- Open, shorted, or corroded wiring at the sensor connectorCommon
- Less commonly, a fueling issue affecting the sensor's switchingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and view bank 2 sensor 2 live to confirm sluggish switching.
- Inspect the exhaust for leaks upstream of and near the sensor.
- Check the sensor connector and wiring for damage or corrosion.
- If the sensor is old and slow with good wiring, replace the downstream O2 sensor. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P013D?+
Yes. The downstream sensor mainly monitors the catalytic converter, so the car drives normally — but it may fail emissions until repaired.
Can I just clear P013D?+
You can, but if the sensor is genuinely slow to respond the code returns after a few drive cycles.
Related codes
Often seen with P013D
Read & clear P013D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX