OBD-II code · Powertrain (generic)
P013B O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 2
Post-cat O2 sensor on bank 1 responds too slowly when mixture transitions from lean to rich. A drifted or sluggish lambda sensor lets the mixture run lean or rich without correction — fuel economy and emissions suffer immediately.
Is it safe to drive with P013B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor aged
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor B1s2
Related codes
- P013DO2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 2
- P014DO2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1
- P014FO2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1
- P0138O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)
- P0139O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- P013AO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2
- P013CO2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2
- P013EO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.