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(Calif. Models)

  1. Inspection is required when trouble code No. 27 exists. Clear trouble codes. See RETRIEVING TROUBLE CODES  in DIAGNOSIS & TESTING in this article. Warm engine to normal operating temperature.
  2. Drive vehicle between 40 and 62 MPH for at least 3 minutes in 4th or 5th gear (M/T) or "D" range (A/T). Fully depress accelerator pedal for at least 2 seconds.
    CAUTION: DO NOT exceed 62 MPH or trouble code will be canceled.
  3. Stop engine and turn ignition off. Repeat previous steps and note if trouble code No. 27 exists again. If trouble code exists again, check sub-oxygen sensor circuit for continuity, shorts or grounds. Replace sub-oxygen sensor if circuit is okay.
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