P013F
O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 2
Oxygen sensor / emissions
Generic OBD-II
Medium
What it means
P013F means the downstream oxygen sensor on Bank 1 (Sensor 2, after the catalytic converter) takes too long to swing from a lean to a rich reading. It usually signals an aging or contaminated sensor. Because this sensor mainly monitors the converter rather than controlling fuel, the car still drives normally, but it can fail an emissions test.
Medium
Can I keep driving? Yes — a slow downstream oxygen sensor mainly affects emissions monitoring; the car drives normally but should be fixed to pass emissions.
Common symptoms
What you'll notice
- Check-engine light on
- Possible slight increase in fuel consumption
- May fail an emissions test
- Occasionally a faint surge or rough-running
Common causes
Most likely first
- Aging or contaminated downstream oxygen sensor (Bank 1, Sensor 2)Likely
- Corroded or loose connector, or damaged wiring at the sensorCommon
- Exhaust leak near the sensor skewing its readingsCommon
- Oil or coolant contamination reaching the sensorLess often
- Upstream fuel-trim or mixture problemLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and graph the downstream sensor's response with a scan tool.
- Inspect the sensor connector, wiring, and for exhaust leaks near the sensor.
- Replace the downstream O2 sensor if it responds slowly.
- Address any upstream mixture or exhaust-leak issues.
- Clear and retest over a full drive cycle.
FAQ
Quick answers
Is it safe to drive with P013F?+
Yes. The downstream sensor mainly watches the catalytic converter, so the car drives normally; the main downside is failing an emissions test until it's fixed.
Can I just clear P013F?+
It will return over a drive cycle if the sensor is genuinely slow. Clearing it only resets the monitor, not the underlying response problem.
Related codes
Often seen with P013F
Read & clear P013F 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