2544-2. MaintenanceEmission inspection and maintenance (I/M) programsSome states have vehicle emission inspection programs which includeOBD (On Board Diagnostics) checks. The OBD system monitors the oper-ation of the emission control system.n If the electronic engine control system warning light comes onThe OBD system determines that a problem exists somewhere inthe emission control system. Your vehicle may not pass the I/M testand may need to be repaired. Contact your Lexus dealer to servicethe vehicle.n Your vehicle may not pass the I/M test:l When the battery is disconnected or dischargedReadiness codes that are set during ordinary driving are erased.Also, depending on your driving habits, the readiness codes maynot be completely set.l When the fuel tank cap is looseThe electronic engine control system warning light comes on as atemporary malfunction and your vehicle may not pass the I/Mtest.n When the electronic engine contro l system warning light goes offafter several driving tripsThe error code in the OBD system will not be cleared unless thevehicle 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.
