20 Most Recent 2003 Ford Mustang Questions & Answers

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3.8L and 4.0L Engines Firing order: 1–4–2–5–3–6 Distributorless ignition system

No as a rule they don't fail at the same time, in fact it is unusual for the hi beam to fail ever, the problem is most likely in the turn signal/multifunction switch, this does cause your problem, have seen it many times.

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 ..

evaporative emission system ? https://www.youtube.com/watch?v=g4ClmBASUco https://www.youtube.com/watch?v=Dfj-F_pTj5M&t=8s

Try this website for help. www.crutchfield.com

here you go
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

check for fuel availability.

There are many possibilities that can cause car to make noise.

It's actually from where the noise is coming from. Front end or rear end. From engine area or from inside the steering or from brakes.

There is N-number of possibilities for the car to make noise or any other familiar kind of noise.

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For step by step troubleshooting this problem, I suggest you to refer the help link mentioned below. Its a complete solution with proper explanation to identify the cause of problem: ------

Click the link below: -----

CAR NOISE ISSUES http://alltypesofpartsreplacing.blogspot.com/2012/11/car-noisesnoisy-cargrinding.html--------

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These will help. Thanks

I'd start by having the tires balanced and remounted. Rotating them wouldn't hurt either. Start there.

80-90 ft/lbs torque . On aluminum wheels check torque after 200 miles . Then again until they do not tighten.

The fuel pump shut-off

switch is located on the

left side of the trunk

between the left rear tail

light and the trunk liner,

and to the left of the

hole in the trunk liner

To reset the switch:

1. Turn the ignition OFF.

2. Check the fuel system for leaks.

3. If no leaks are apparent, reset the switch by

pushing in on the reset button.

4. Turn the ignition ON.

5. Wait a few seconds and return the key to OFF. 6. Make another check of leaks

Code 171 is system to lean "1" code 174 system to lean "2" code 420 catalyst system efficiency below code 530 a/c refrigerant pressure sensor "A" sounds like o2 sensors are bad or vacuum leak

The idle is completely computer controlled, it is not adjustable.

sounds like its a little low on coolant.

I suggest look in the owners manual; check and download for free in this links:
- https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
- http://www.ownersmanualsource.com/ford/ford-mustang-owners-manuals/ (end page)

Hope helps (remember to rate this answer).

Sensors do not need to be recalibrated , the ecm should have the codes cleared . Then turn the ignition system on with data reader hooked up to see if sensors repaired the fault code.

position sensors have little to do with rough running engine items like bad injectors, problem ignition control module, fuel pressure , HT leads valves, vacuum leaks all contribute to rough running best run the fault codes first to determine what area to look at and fix the reported faults

There are two possibilities...

1. The crankshaft and camshaft sensors are not properly synchronized to each other. This is a procedure that must be performed with special tools.
2. A bad alternator diode can cause this code to set due to voltage ripple. Have the alternator/charging system tested.