P2416 O2 Sensor Signals Swapped (Bank 1 Sensor 2 / Bank 1 Sensor 3)

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.

Likely causes

Symptoms

• Check engine light shortly after an exhaust or sensor repair
• Catalyst monitor not completing or giving implausible results
• Usually no noticeable driveability change

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, static.nhtsa.gov.