Hello, thank you for choosing Just Answer. My name is XXXXX XXXXX X will advise you concerning your Montero's incomplete readiness tests.

Don't despair, sometimes driving a long distance is not sufficient to complete a "drive cycle" and satisfy the requirements of the readiness tests. The Montero is actually listed by the EPA as being a troublesome vehicle to reset the readiness tests.

As a result, Mitsubishi released a detailed set of instructions concerning resetting the readiness tests. The complete document can be FOUND HERE.

Much of this is technical mumbo-jumbo, but the specific parameters are spelled out to reset every monitored system. Either you or your mechanic will need to perform the specific drive cycles detailed until enough readiness tests are complete to satisfy your state's requirements. Some states allow up to two tests not complete, others require all to be ready.

I suggest doing most of these on a lightly traveled stretch of road, at night if possible. You will notice that many require holding a constant speed for a period of time. Also some of them require a particular RPM range or throttle position be used and maintained. Sometimes it helps to turn off overdrive to raise the engine RPM to the specified range. You can see why regular driving may not reset the tests. If you were to use 3/4 throttle instead of 1/2 throttle it might not satisfy the requirements of a particular test.

I hope that is somewhat clearer than mud. If you have additional questions, don't hesitate to ask.

Best Regards,
Stephen