Powertrain
generic / SAE
P241B
O2 Sensor Signals Swapped Bank 2 Sensor 1 and Sensor 2
The pre- and post-catalyst lambda signals on bank 2 are swapped - the upstream sensor responds like a downstream sensor and vice versa. Typically the harness was reversed during a sensor change.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 1B
Possible causes
- Harness swapped during repair high
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 40–150 €
- Estimated time: 0.3–0.8 h
- Component: oxygen sensor b2s1
- Component: oxygen sensor b2s2
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012