P2416O2 Sensor Signals Swapped (Bank 1 Sensor 2 / Bank 1 Sensor 3)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2416 means the engine computer concludes that the two downstream oxygen sensors of bank 1 - sensor 2 after the first catalyst and sensor 3 after a second catalyst, as used mainly on SULEV/PZEV vehicles - are connected the wrong way round. No manufacturer publicly documents the detection logic for P2416. By analogy with P0040, which VW sets when the lambda controllers of the two front sensors move beyond their limits in opposite directions, the check compares the expected and actual response of each sensor. The usual cause is swapped connectors after a sensor replacement or harness repair. CARB requires secondary oxygen sensors to be monitored for proper function. P2417 is the bank 2 counterpart, P0041 a swap between banks.
- What you may notice
- Check engine light shortly after an exhaust or sensor repair
- Catalyst monitor not completing or giving implausible results
- Usually no noticeable driveability change
- Likely causes
- LikelySensor 2 and sensor 3 connectors swapped after a repair
- PossibleWrong sensor type or harness length fitted in one position
- RareWires crossed in a harness repair
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €150
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.