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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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Repairs0Labor1040Torque1598Fluid17DTC3336Battery2Maintenance0Recalls5
P0429low severityPowertrain

Catalyst Heater Control Circuit (Bank 1)

on 1998 Toyota Tacoma 2.7L I4 · RWD

What this code means

The PCM detected a fault in the bank 1 catalyst heater control circuit. The heater helps the converter reach operating temperature faster for emissions control.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Slow catalyst warm-up

Common causes

  • Faulty catalyst heater
  • Open or shorted wiring
  • Blown fuse or relay
  • Faulty PCM driver

Diagnostic steps

  1. Scan and confirm P0429
  2. Test heater circuit continuity
  3. Inspect wiring and fuse
  4. Verify PCM control signal
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