Under certain driving conditions, some 2006 model year IS 250 vehicles may exhibit a M.I.L. “ON” condition with one or both of the following DTCs:
-P0172 (System Too Rich [Bank 1])
-P0175 (System Too Rich [Bank 2])
The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to improve this condition.
NOTE:
-Version 13.3a or later Diagnostic Tester software is required to perform this procedure.
-Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in step 1 of the Repair Procedure).
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