Powertrain
generic / SAE
P01F1
O2 Sensor Circuit Bank 1 Sensor 4
Generic electrical fault on the bank 1, sensor 4 oxygen sensor (fourth sensor downstream — used on systems with multiple cat stages or NOx-trap diagnosis).
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / F1
Possible causes
- Sensor failed 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: 80–400 €
- Estimated time: 0.5–2 h
- Component: oxygen sensor b1s4
- Component: sensor wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012