I have a 1996 mark viii with a check engine light that won't go off! I had the ecu checked at a lincoln dealer and it said I had a problem with code #720. That is the output sensor on the transmission which is not making a complete circuit. I had the ecu replaced( flashed) installed but the check eng. light is still on? The input and output sensors have been replaced along with both oxygen sensors. What else can I do to get this fixed?


Asked by May 12, 2007 at 01:40 AM about the 1996 Lincoln Mark VIII 2 Dr STD Coupe

Question type: Maintenance & Repair

The trans. shifts all right, but it winds out in first gear and shifts hard the first time you start the car and then will shift ok after you stop and go, but if you kill the eng. and start the car again it will shift out of first hard again? the check eng. light and the trans. shifting hard are probably conected?

3 Answers


I'm sure the two are at the crux of the problem, but what and where do I go from here? what about the output sensor? Why is the ecu not getting a signal back from the sensor? Do you know of anyone that has had this problem? Let me know, Thanks joag5252

1 out of 2 people think this is helpful.
Matt Nelson

check www.markviii.org they have answers to most questions, if you cant find it just ask, and users will be happy to help you out

1 out of 1 people think this is helpful.

Hard shifting indicates a needed transmission 1-2 shift accumulator piston and spring replacement. Do this simple fix if you are experiencing shifting problems. It may be a good idea to do it even if you don't have problems yet, as the bore gets worn from the original parts. Click this link for accumulator replacement instructions (with pictures) and part numbers: http://www.markviii.orgLOD2part_numbers.htm#Spring

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 1998 lincoln mark 8 dashborad lights 2 answers

    my dash lights are out along with cruise control. any suggestions as to what can be done to repair.

    1998 Lincoln Mark VIII


    Maintenance & Repair

  • it just died and now nothing works. 2 answers

    was going down the road and the gauges went nuts for a second and the motor shut off,now the power windows/locks/seats and basically everything electrical won't work at all.it cranks over fine but w...

    1998 Lincoln Mark VIII


    Maintenance & Repair


    My car is stuck in park mode can't move it out of park,then found out I had no brake lights.Thought they went hand in hand so I changed the brake light switch have the same problems. Does anyone hav...

    1997 Lincoln Mark VIII 2 Dr LSC Coupe


    Maintenance & Repair

  • My 96 Lincoln Mark VIII is overheating 6 answers

    I had to drain the coolant in order to replace the oil filter adapter gasket. After the repair, I attached everything back, and there are NO leaks of any kind...oil or coolant. I was happy with th...

    1996 Lincoln Mark VIII 2 Dr LSC Coupe


    Maintenance & Repair

  • Where is the original equipment stock AM/FM radio antenna on a '98 Linc. Mark VIII? 42 answers

    Is it electric up/down or a fixed wire in the front windshield?

    1998 Lincoln Mark VIII 2 Dr LSC Coupe




Looking for a Used Mark VIII in your area?

CarGurus has 67 nationwide Mark VIII listings and the tools to find you a great deal.


Search Lincoln Mark VIII Questions

Lincoln Mark VIII Experts

#1 Paul Thoreson
Paul Thoreson
Reputation 470
#2 dawneichten
Reputation 440
#3 Tom Demyan
Tom Demyan
Reputation 330
View All

Related Models For Sale

Used Lincoln Continental"
2,010 listings starting at $42,556
Used Lincoln Town Car"
48 Great Deals out of 2,364 listings starting at $1,542
Used Ford Mustang"
731 Great Deals out of 41,065 listings starting at $900
Used Cadillac Eldorado"
462 listings starting at $7,995
Used Cadillac DeVille"
2,378 listings starting at $1,495
Used Pontiac Grand Prix"
30 Great Deals out of 4,356 listings starting at $1,995
Used Pontiac Firebird"
9 Great Deals out of 904 listings starting at $2,900
Used Ford F-150"
3,268 Great Deals out of 216,650 listings starting at $1,500
Used Ford Thunderbird"
36 Great Deals out of 1,193 listings starting at $6,777