I have the code p1151 on my 1998 ford mustang, What is this and how do I repair it?

check here...

https://www.google.com/search?q=2005+ford+mustang+overdrive+flashing&rlz=1C1CHBD_enUS885US885&oq=2005+ford+mustang+overdrive+flashing&aqs=chrome..69i57j0i22i30j0i390i650l2.6288j0j4&sourceid=chrome&ie=UTF-8

The standard OBD2 P0*** codes are very easy to find. Your can google

1999 Ford Mustang P0095 for exaple and get a full breakdown of the issue and the fix

https://www.google.com/search?q=ford+mustang+obd2+codes

also note you have a '1999 Ford Mustang GT' not a '99 mustang gt'. details matter to Mr Google to get best results :>D ..

all in the links

P1125 FORD Code - Throttle Position Sensor Intermittent

https://www.engine-codes.com > p1125_ford
Faulty Throttle Position Sensor · Throttle Position Sensor harness is open or shorted · Throttle Position Sensor circuit poor electrical connection.
Missing: Error ‎P1120

• 
  

  P1120 FORD Code - Throttle Position Sensor Out of Range

  https://www.engine-codes.com > p1120_ford
  Malfunction is detected when voltage from the sensor is sent to Engine Control Module (ECM) is out of range. 'What are P1120 FORD code possible symptoms? Engine ...
  

https://www.google.com/search?q=2003+Mustang+GT+DTC+Error+Code+P1125+and+P1120

..

https://mustangforums.com/how-tos/a/ford-mustang-v6-and-ford-mustang-gt-2005-2014-fuse-box-diagram-400063

There's this website www.reliable-store.com
They have books on ALL vehicles.
it covers wiring diagrams, electrical diagrams,
fuse diagram, torque specs, PCV, error codes, fault codes, service info, repair info, parts info, owner's/
service/repair/parts/maintenance manuals etc everything totally..
I have 1987 toyota 4runner model and I keep servicing and when needed repair it on my own. worth it !!!

https://www.youtube.com/watch?v=iikON1hBrro

here is a you tube video explaining the issue

• It could be an easy fix and it may not be. That light indicates something with the emissions has malfunctioned. You need to have the code read to know what is wrong. You can go to Auto Zone and have it read for free. Otherwise you will have to go to a repair shop or the dealer and have the code read for a fee. If you get the code pulled you can post the code here and I will return to answer what is wrong and how to fix it.

Regards, Tony

check idle air control valve

take it to your local autozone and have them do acel test on it. they can tell you what system is not working properly

If you go to autozone.com and go to repair info. You will need to put in your make,model, and year. When you go to the repair guides. Go to chasis electrical and lookup wiring diagrams. You will find it there. IF you need any help determining the color codes or what you are lookin at. I have 2 shop manuals. A Chiltons and Hayes manual. I would be glad to assist you.