Sub Oxygen Sensor OX

The sub-oxygen sensor is used on California and some Federal engines. It is used to monitor the exhaust stream after the catalyst to determine if the air/fuel mixture is within the range for efficient converter operation.

Exhaust Manifold

Exhaust Manifold

The sub-oxygen sensor is identical to the Zr02 main oxygen sensor located ahead of the catalyst. Information from this sensor is used by the ECU to fine tune the air/fuel ratio and improve emissions.

Oxygen Sensor Terminal Identification

OX1

Main Oxygen Sensor

Analog signal representing pre-catalyst exhaust oxygen content

0X2

Sub-Oxygen Sensor

Analog signal representing post-catalyst exhaust oxygen content

ox

Oxygen Sensor Signal

Titania Oxygen Sensor Analog Signal

OX+

Oxygen Sensor Reference

Titania Oxygen Sensor Reference Voltage

HT

Oxygen Sensor Heater

Sensor heater current path

Ei

Earth Ground

Sensor ground return path

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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Responses

  • marko
    Where is sub oxygen sensor on 95 toyota corolla with California emissions?
    2 years ago
  • abbie
    How to rectify sub oxygen sensor signal?
    1 year ago
  • anneli
    What is a main and sub o2 sensor?
    7 months ago
  • stanley
    Can i disconnect sub oxygen sensor on 89 t0yota 5sfe?
    7 months ago

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