3994-2. Maintenance4Maintenance and careGS_G_UMarch 29, 2010 3:11 pmEmission inspection and maintenance (I/M) programsSome states have vehicle emission inspection programs which include OBD (On Board Diagnostics) checks. The OBD system monitors the oper-ation of the emission control system.n If the malfunction indicator lamp comes onThe OBD system determines that a problem exists somewhere in the emission control system. Your vehicle may not pass the I/M test and may need to be repaired. Contact your Lexus dealer to service the vehicle.n Your vehicle may not pass the I/M test:l When the 12 volt battery is disconnected or dischargedReadiness codes that are set during ordinary driving are erased. Also, depending on your driving habits, the readiness codes may not be completely set.l When the fuel tank cap is looseThe malfunction indicator lamp comes on as a temporary mal-function and your vehicle may not pass the I/M test.n When the malfunction indicator lamp goes off after several driv-ing tripsThe error code in the OBD system will not be cleared unless the vehicle is driven 40 or more times.n If your vehicle does not pass the I/M testContact your Lexus dealer to prepare the vehicle for re-testing.
