OBD-II code · Powertrain (generic, extended)
P241A O2 Sensor Signals Swapped Bank 1 Sensor 1 and Sensor 2
The pre- and post-catalyst lambda signals on bank 1 are swapped - the upstream sensor responds like a downstream sensor and vice versa. Typically the harness was reversed during a sensor change.
Is it safe to drive with P241A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHarness swapped during repair
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
- 0.3–0.8 h
- Emissions test
- Likely to fail
- Parts involved
- Oxygen Sensor B1s1, Oxygen Sensor B1s2
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.