Question about 1998 Mitsubishi Montero Sport

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Will not pass inpection, 5 sensors not ready--V6 3.0

My 1998 mm sport will not pass inspection because 5 sensors are not ready. Vehicle has 255000 miles but still runs good. There are no error codes showing. Engine service light comes on normally and goes off when I start up. I have driven the vehicle about 2000 miles trying to get the sensors ready. I have taken the btry cables off over night to reset computer, also replaced btry terminals. Took it to dealer today and the computer was receiving data from all sensors. The dealer said to drive for 60 miles non stop and they would reset. Didn't work. Sensors not ready are EGR,Catalyst,Evap,O2 Sens,O2 Sens Htr. Any ideas?

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  • smithdrjwr Apr 17, 2009

    Thanks Keven for the response. I drove the car for about 125 miles didn't turn it off and checked the system with my scan tool and it still shows all 5 sensors not ready. This has been an ongoing problem for almost 2 months. thanks again for the answer

  • Anonymous Mar 14, 2014

    How many sensors can read not ready to pass an inspection



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Drive the car for 2 miles non-stop and take it to smog inspection WITH OUT TURNING OFF THE CAR!! the key is that the car goes threw the test while the engine is running ...

if the car is turned off ... u will have to repeat procedure ...

Posted on Apr 17, 2009

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The monitors are called "non continuous readiness monitors" 5 of them for the mit 1998 montero order to have them set to "ready" status to pass the computer part of the smog emissions have to drive the car through a very specific "drive cycle" , You can get the exact drive cycle parameters for the car at google search "mitsubishi montero sport 1998 readiness monitors drive cycle." ...its about driving in a very exact pattern at speeds at time intervals(the obd computer on the car has programmed it that way...the 02 sensors generally will set if you drive the vehicle at 40 mph for 2 minutes continuously(check with a cheap Autel obd2 scanner($25.00 on; then the catalyst monitor the vehicle needs to be driven at 60 mph for 10 seconds and then slow down to 40 mph for 50 seconds and then finally drive for 2 more minutes at 40 mph mindful that this may take several attempts but keep at this parameter and you'll have them set....and you have to find a safe long empty road or highway to do some of the drive the o2 sensors and catalyst monitors.) The EVAP monitor is the last one you have to set and this one has to be done very specifically..the vehicle has to have the other monitors set and then let the car sit overnight to cool down as the evap monitor requires a cold start; immediatelly after starting within 15 the vehicle at 50-55 mph mph for two minutes and then increase immediately to 60 mph for 2 more minutes.....this should set the last monitor..again check the google search site above with the mitsubishi service bulletin on google search for exact details.

THEN if you finally get it set...remember that you should NOT disconnect the battery after having set the monitors...........otherwise the obd2 computer will erase the readiness monitors and being deleted you will have to REDO the drive cycles again.......waste of gas and time.

And ALSO in order to pass smog finally your car has to pass the biennial tail pipe 5 gas analyzer test....usually with mitsubishis of the 1998 model the problem is the high solve this you will have to replace the valve stem seals(24 of them in the cylinder heads) and also the piston rings and oil control holes in the pistons.....I had to clear 6 holes / piston...they had been carbonized shut after 350000 miles of wear and tear cycles. This is an engine unless you have lot of time on your hands and you are interested in fixing it yourself........took me 3 weeks to do it may have to go through the CA BAR(bureu of automotive repair) they'll help pay for about $400.00 towards the repair......

if you are inclined to do this if you pass the computer obd2 test but fail the emissions section then you can begin with the manual and order the valve stem seals on

Benjamin Chung

Posted on May 15, 2015


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1. Start the engine when the engine coolant

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