Sorry, it was in front of me all the time, under
1991-1995 passenger car and light truck.
Ford EEC-IV system
3 _digit diagnostic codes.
The 125 is the trottle position sensor circuit voltage lower than expected.
The O2 was not the problem, it just monitor what is going on.
An open TPS signal the computer that the trottle is allways closed, resulting in poor performance, trigger the oxygen sensor and sett the code.
A wide open trottle is 5 volts.
Your sensor might give 1.25 volt that indicate a constant close trottle( same as circuit voltage lower than expected)
what you need to do is to change the tps, make sure the connector is clean. Make sure the wire is not broken, because there an open.
Let me know what happens.
Thank you for the feedback, I really appreciate it.
Sorry for asking where you were from, I was just confuse with the codes.
Keep me updated.
Monday, October 12th, 2009 AT 3:19 PM