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Exhaust Gas (Oxygen) Sensor

If fault is present in oxygen sensor circuit, Code 33 will be set in ECU memory. If Code 33 is set, go to CODE 33 diagnostic procedures in TESTS W/CODES article. Check sensor voltage values against values in EXHAUST GAS (OXYGEN) SENSOR VOLTAGE TEST table. Replace sensor if values are not as specified.

EXHAUST GAS (OXYGEN) SENSOR VOLTAGE TEST (1)

Condition Volts
Lean .1
Rich 1.0
(1) With engine running at normal operating temperature, measure voltage between oxygen sensor connector terminal and ground.
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