Hi
That code (im guessing a P0171) is telling you the O2 sensor is registering too much air left over after combustion. That could be a possible faulty o2 sensor (can be checked with a DVOM) or you have a vacuum leak on that side of the engine.
As for the brakes, do a physical inspection. If the brake light is on, that could down to low brake fluid or a inbalance in the hydraulic system of the brake lines. Are the pads and rotors grinding?
So auto shops will offer a free brake inspection. Just an FYI.
Hope this helps.
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1993 2.3 Mustang Convertible
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