My SES light came on and i went to Autozone to have it diagnosed and it threw two codes. I had them print me out the codes and the definitions that came with it and here is what they say.

Code: P0125

Definition: Coolant temp is always low

Explanation: The PCM verifies that the engine is at a proper operating temp.

Probable Causes:
1. Check Coolant Lever
2. Thermostat Defective
3. ECT sensor Defective

Code: P1131

Definition: Lack of Bank 1 O2 transistions- Lean

Explanation: ECM detected bank 1 O2 at its lean limit

Probable Causes:
1. Misfire On Bank 1
2. Vaccum Leak Affecting Bank 1 Only
3. Fuel Injector Problem Bank 1
4. Engine Mechanical Condition

My Stang is a 2002 with 67.5K miles on it. I checked the coolant level and it is way above the "Add Coolant" line.
Any kind of suggestions would be appreciated because number 4 on code P1131 kinda worries me a little bit but i doubt that is what is wrong.

 

Hmm... I know somebody on here was talking about one of these the other day.

Just cant think of who it is.

 

Have you checked the thermostat and/or ECT sensor yet?[/align][/align]Does the temperature gauge reach normal operating temp (someplace near the middle of the range)?[/align][/align][/align]

 

For the P1025 it is more then likely your ECT. Buy a new one and clear the code.

For the P1131 it is probably a vacum leak but could also be your MAF is dirty. Try cleaning the maf and check for a vacum leak.

 

Seen several po125 codes and the t-stat was the problem...stuck open or came apart .....or a 160 t-statin where it needed to bea 192-195....