QuestionTo Knucklebusters. 6 cyl, 4.0 67000 miles. My wife went to Auto Zone in NJ and bring this reading;
TROUBLESHOOTING P0720
Definition - Low output speed sensor speed above 15 mph
Explanation - Vehicle speed above15 MPH while transmission output shaft speed below 60 RPM
Probable causes - 1.-Failed output shaft speed sensor
2.-Electrical problem
I have friend, 20 yrs experienced buss mechanic and European auto mechanic H.S. graduate. Understand English a little. Want to help me locate the problem. First he change $30 gas filter which did not solve the problem. Now he wants to change all parts that belong to tune up because we never did tune up. He say he will change everything until we find the problem. I don't like this way of expensive thinking an I am looking for more knowligable suggestion, perhaps from you. As for changing, as machinery mechanic I think I am able to change some things myself except that car owner manual is very poor and it dose not say or show where parts like sensors and others are located. I also can not find anything on Internet where it would show location of shaft speed sensor (and any other part), how it look like, how to repair it or change. Can you please help me diagnose "check engine" problem and give me some links so I will at list learn how those unknown parts in our car look like, their purpose and where they are?! Is very hard to maintain any car wondering what the heck now they put in your car. Also Kevin, car have alarm - I just don't want to do anything to screw it.
AnswerHi Mario,
Are you trying to tune it up or fix the speed sensor?
The speed sensor (output) is located internal of the transmission and is serviceable through the tailhousing of the trans. Easy to locate because it will be the only sensor attached to the tailhousing of the trans. Replacing that should take care of the SES light.
As far as the tune-up items. Plugs, wires, cap, rotor, PCV valve, belt(s), air filter, fuel filter and an oil change is about all that a standard tune-up involves. Even someone with only basic car knowledge should be able to easily tune-up their own car.
Looking for a reputable service technician? My advice on finding a good technician is: Steer clear of the dealership and 'chain' stores like Firestone, Sears, Pep Boys, Monro Muffler/Brake, Midas, etc. as they usually only employ ONE ASE Certified Tech just so they can say they do and chances are, that guy is the asst. manager or manager and is not in the store to diagnose/repair vehicles anyway. Find a service location in the link below or get some names out of the yellow-pages and do a drive-by. Garages that employ ASE Certified Technicians will be marked with the 'Blue-Seal' insignia. If unsure about whether a place employs Certified Techs, just ask to see their credentials. ALL ASE Certified Technicians will be PROUD to show and display their certificate(s).
Thanks for the question, I hope this information was helpful to you.
Fred
Knucklebusters Used Auto & Truck Parts, Inc.
www.knucklebusters.us
570-453-0910
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