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HO2S Heater Monitor Readiness Code: Procedure

  1. Connect the scan tool to the vehicle's data link connector (DLC), and bring up the tool's generic OBD II mode.
  2. Start the engine, and let it idle for 1 minute. The readiness code should switch from incomplete to complete.
  3. If the readiness code is still set to incomplete, check for a temporary DTC. If there is no DTC, repeat the procedure.
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