4154-2. Maintenance4Maintenance and careEmission 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.nIf 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. Cont act your Lexus dealer to service the vehicle.nYour vehicle may not pass the I/M test in the following situations:lWhen 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.lWhen the fuel tank cap is looseThe malfunction indicator lamp comes on indicating a temporary malfunction and your vehicle may not pass the I/M test.nWhen the malfunction indicator la mp still remains on after several driving tripsThe error code in the OBD system will not be cleared unless the vehicle is driven 40 or more times.nIf your vehicle does not pass the I/M testContact your Lexus dealer to prep are the vehicle for re-testing.
