P014B
O2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 2
Fuel & air metering
Generic OBD-II
Medium
What it means
P014B means the downstream oxygen sensor on bank 2 (sensor 2, after the catalytic converter) takes longer than allowed to swing from a lean to a rich reading. It usually points to an aging or contaminated sensor, sometimes an exhaust leak. The car drives normally, but the slow response affects emissions monitoring and can trip an emissions test.
Medium
Can I keep driving? Safe to keep driving — this is an emissions/monitoring fault on a downstream oxygen sensor, not a running or starting problem.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Slight drop in fuel economy
- May fail an emissions test
Common causes
Most likely first
- Aging or contaminated downstream oxygen sensor (bank 2, sensor 2)Likely
- Exhaust leak near the sensor skewing readingsCommon
- Wiring or connector fault at the sensorCommon
- Sensor contamination from oil, coolant, or siliconeLess often
- Faulty ECM/PCM (rare — rule out the sensor first)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data to see when the code set.
- Inspect the exhaust for leaks upstream of the sensor.
- Check the sensor's wiring and connector for damage or corrosion.
- Watch the bank 2 sensor 2 response on a scan tool — a lazy switching pattern points to a tired sensor.
- Replace bank 2 sensor 2 if it responds slowly. Clear and re-test over a drive cycle.
FAQ
Quick answers
Is it safe to drive with P014B?+
Yes. It's a downstream oxygen-sensor response fault that mainly affects emissions monitoring, not drivability. Still fix it to pass emissions and clear the light.
Can I just clear P014B?+
You can, but it returns after a few drive cycles if the sensor is slow to respond or an exhaust leak is skewing it.
Related codes
Often seen with P014B
Read & clear P014B 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