OBD-II code · Powertrain (generic, extended)
P2414 O2 Sensor Exhaust Sample Error Bank 1 Sensor 1
Same as P237A but on the upstream sensor B1S1 (pre-catalyst). 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 P2414?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensing element fouled
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor B1s1
Related codes
- P237AO2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P23A0O2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P23A1O2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P2411Fuel Cap Sensor/Switch Circuit
- P2412Fuel Cap Sensor or Switch Circuit Intermittent or Erratic
- P2413Exhaust Gas Recirculation System Performance
- P2415EVAP Switching Valve Circuit Open
- P2416EVAP Switching Valve Performance
- P2417EVAP Switching Valve Stuck Closed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.