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2003 TOYOTA TACOMA
2.7L I4•RWD•AUTOMATIC•gas•3RZ-FE
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1066Torque2197Fluid17DTC3480Battery2Maintenance0Recalls5
P2416moderate severityPowertrain

O2 Sensor Signals Swapped Bank 1 Sensor 2 / Bank 2 Sensor 3

on 2003 Toyota Tacoma 2.7L I4 · RWD

What this code means

The controller detected that oxygen sensor signals appear crossed or swapped between Bank 1 Sensor 2 and Bank 2 Sensor 3. This usually means the sensors are wired to the wrong locations.

Symptoms

  • Check engine light on
  • Poor fuel economy
  • Failed emissions test

Common causes

  • O2 sensor connectors swapped during service
  • Wiring harness crossed or miswired
  • Faulty oxygen sensor
  • Corroded sensor connectors

Diagnostic steps

  1. Verify each O2 sensor is connected to correct location
  2. Inspect wiring harness routing and connectors
  3. Compare sensor readings with scan tool
  4. Repair miswiring or replace faulty sensor
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