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HO2S Heater Monitor Readiness Code: Procedure

  1. Connect a scan tool or the HDS to the vehicle's data link connector (DLC). Bring up the tool's generic OBD II mode (scan tool only).
  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.