HOW I CAN FIX THAT
Here's a link to the issues associated with a P0174 code:
http://engine-codes.com/p0174_mitsubishi.html
There's a bit of a punch list of stuff that could be causing this code. If you have never changed the O2 sensors on this car that is where I would start; replace all of them. Get OEM exact replacements versus "universal" fit O2 sensors.
The Mass Airflow Sensor (MAF) may be dirty. There is specially formulated cleaner for removing any built up mung on the sensor.
The PCV system can be checked for proper flow. Replace the PCV and/or clean the system if there is no valve.
Bring the car in and have the injectors professionally cleaned.
You're probably in the neighborhood of 165-170K. If you've never done any preventive or regular maintenance then there could be a lot of issues with your car. The P0174 is a lean condition. It could be bogus inputs to the engine management computer (via bad O2 sensors and/or a dirty or bogus MAF sensor). It could be really dirty injectors because they've never been cleaned and if you've been filling up with non-top tier fuel (because you're saving 2 cents a gallon) then it's a sure bet the injectors are dirty. Running lean comes from air leaks into the manifold post MAF sensor. This could be from rotted vacuum hoses or cracked/broken vacuum fittings. There's just too many possibilities to be able to nail it down for sure. Use the link and the info there to start your trouble shooting.
P0174 Mitsubishi System Too Lean Cylinders 2 3
With the Air Fuel Mixture Ratio Self...
SOURCE: Mitsubishi montero radio code
Pull out the radio far enough to see the serial number and model number. Take that and the registration to the dealer who will give you the code you need.
SOURCE: Replace Spark Plugs on a Mitsubishi Montero Sport 2001
http://www.autozone.com/autozone/repairinfo/common/repairInfoMain.jsp?targetPage=productsHowToInspect&leftNavPage=productsHowTo&pageId=%090900c15280213e6e&subtitle=service
Try to copy and paste this web site. It's for Auto Zone. It will tell you all you need to know about your vehicle.
Good Luck and hope this helps.
SOURCE: Mitsubishi Montero Sports will not start...
I HAD THE SAME PROBLEM. I TOOK THE AIR FILTER HOSE OFF THE CARBARATOR AND ADDED CARBARATOR CLEANER. PUT IT BACK ON, AND WORKED. TRY THAT.
SOURCE: Montero Sport, Automatic transmission fluid change
I definetly highly reccomend you to use Mitsubishi genuine Diamond SPIII Fluid, you'll feel your transmission more powerfull, and will help you to keep it just like new. I've tried with "Import multivehicle" from Castrol but a within 6 months the gears began to slip.
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