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readiness codes

  1. won't read readiness codes

    NG900 & OG9-3 Workshop
    1998 Saab 900s won't read readiness codes for: 0xygen sensor heater Oxygen sensor Evap sys Cat (There are no pending codes. 02 sensor is working. Did driving cycle SI no. 248-9037 four times) Any suggestions? thanks, darby
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