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1998 TOYOTA TACOMA
2.7L I4•RWD•AUTOMATIC•gas
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1038Torque1596Fluid17DTC3336Battery2Maintenance0Recalls5
P0416low severityPowertrain

Secondary Air Injection System Switching Valve B Circuit Open

on 1998 Toyota Tacoma 2.7L I4 · RWD

What this code means

The PCM detected an open condition in the secondary air injection switching valve B circuit. This impacts exhaust air delivery during warm-up.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Rough cold idle

Common causes

  • Faulty switching valve B
  • Open circuit wiring
  • Corroded connectors
  • Faulty PCM driver

Diagnostic steps

  1. Scan and confirm P0416
  2. Inspect wiring and connectors
  3. Measure valve resistance
  4. Check PCM control output
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