How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Doug C. Your Own Question

Doug C.
Doug C., ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6108
Experience:  Mitsubishi employed and Factory trained ASE certified technician
Type Your Mitsubishi Question Here...
Doug C. is online now
A new question is answered every 9 seconds

2001 Mitsubishi montero: The check engine light is on

Customer Question

Hello. I have a 2001 Mitsubishi montero with 155K on it. The check engine light is on. I took it to my mechanic and after he scan it, he told me that I needed a Mass air flow sensor. So I replace it. The check engine light went off,but now I have to dive it like 100 miles to "reset the computer" before I go get the yearly inspection. My question is, if I drive 100 miles will it reset the computer or not ? and if not what can I do to reset it ?
Submitted: 3 years ago.
Category: Mitsubishi
Expert:  Doug C. replied 3 years ago.
Hi,
They are referring to the OBD drive cycle monitors that are required to be "complete" for your inspection. When you have your inspection done, if you are in a state/county that does monitor status tests, they will hook up to your computer and verify that all tests are complete and passed. If any are listed as not complete (or obviously 'fail'), then you will not pass your inspection.

100 miles is just a ballpark rule of thumb to assume that all of your monitors have had time to complete. Realistically with normal driving they will all complete within a few days or less; they are run constantly whenever the testing criteria is met.

If you wanted to force the monitors to run, you can do this, it is quite a drawn out affair however, which is why it is common to just say "drive the vehicle", as they will all run relatively soon.

For reference, the forced patterns are similar to this:
Drive vehicle to 38mph and hold for 90 seconds, decelerate to 18mph, accelerate to 38mph and hold for 20 seconds. Decelerate to 18mph, hold, then decelerate to a stop.
Repeat 3 times.

Et cetera. That is one of the force patterns; there are 18 for this car, and they all must be performed with a scan tool connected to verify correct output.

For simplicity, it is much easier to just drive the car. If you would like, I do have a listing of all applicable drive patterns for your vehicle if you are in a rush to get inspected. Just let me know if you would like to check them out and I can upload them.

Thanks
Customer: replied 3 years ago.
Ok please upload the drive patterns. I'm try them. After the airflow sensor was change,I get the code on the scanner "O2 bank..........." That is why my mechanic say I should diveit to reset the computer.
Expert:  Doug C. replied 3 years ago.
No problem, give me just a few minutes as there are several.

Regarding a code reoccurring, this is happening because there is still a problem. Drive cycles and force readiness tests only confirm that everything is OK, they will not correct and existing issue.
Expert:  Doug C. replied 3 years ago.
List of applicable monitors:

graphic
graphic

Actual force pattern drive cycles for the patterns listed in the right column:
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic
graphic

Sorry for the delay, as you can see there were quite a few to capture.

Again, if you have a trouble code that is recurring, these will NOT correct any issue, they will only force the computer to run it's diagnostics early. If you have a trouble code that is still being set, it will need to be corrected first. If you have the code # XXXXX'd be happy to help you with that as well, just let me know.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Doug C.

    ASE Certified Technician

    Satisfied Customers:

    3981
    Mitsubishi employed and Factory trained ASE certified technician
< Last | Next >
  • http://ww2.justanswer.com/uploads/SU/superbovine/2012-6-6_233210_547717101510889173290181666093332n.64x64.jpg Doug C.'s Avatar

    Doug C.

    ASE Certified Technician

    Satisfied Customers:

    3981
    Mitsubishi employed and Factory trained ASE certified technician
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    243
    ASE Master tech 15+ years
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ase master

    Satisfied Customers:

    172
    30 yrs foriegn and domestic, gas and diesel
  • http://ww2.justanswer.com/uploads/05/05muranosl/2012-1-26_195212_JA.64x64.JPG Jake's Avatar

    Jake

    Automotive Technician

    Satisfied Customers:

    111
    Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
  • http://ww2.justanswer.com/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG Mike Kelly's Avatar

    Mike Kelly

    Mitsubishi Mechanic

    Satisfied Customers:

    104
    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
  • http://ww2.justanswer.com/uploads/AM/amdhcds/2012-4-1_04039_3911361015044607312849462040349387767831419345287n.64x64.jpg AMD's Avatar

    AMD

    Master Technician

    Satisfied Customers:

    48
    L1 Advanced Level Diagnostics Specialist
  • http://ww2.justanswer.com/uploads/pentico/2008-11-09_032258_dad1.jpg BigBob's Avatar

    BigBob

    Service manager/Technician

    Satisfied Customers:

    45
    25 years in the auto repair business