Powertrain
generic / SAE
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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 14
Possible causes
- Sensing element fouled high
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–350 €
- Estimated time: 0.6–1.5 h
- Component: oxygen sensor b1s1
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012