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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Engine Control System Self-Diagnostics - 4 CYL (PZEV)) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank No. 1) >> Monitor Strategy

Monitor Strategy

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

  1. Main Sensors

    A/F sensor and heated oxygen sensor No. 2.

  2. Related Sensors

    Engine coolant temperature sensor, intake air temperature sensor, engine speed sensor, mass air flow meter and park/neutral position switch.

  3. Frequency Of Operation

    Once per driving cycle.

  4. Duration

    About 30 seconds.

  5. MIL Operation

    Two driving cycles.

  6. Sequence Of Operation

    None.
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