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FUEL pressure, or possible egr valve malfunction.
first thing i would look at is fuel filter,probably half plugged, then it would be fuel pump. check it by putting a fuel pressure guage on the fuel rail and monitor pressure,hopefully your car has a fuel rail monitoring port.
A malfunction indicator light comes on because a detector elsewhere in the item has noticed a malfunction in whatever it is monitoring.
There is no fuel pressure test port on an 02 focus. The computer controls the fuel pressure on these and as such the factory approved method of monitoring fuel pressure is to watch the PID on your scan tool. They do make one that can be added on though between the fuel line and the fuel rail. A quick google search should yield plenty of results to help find one.
You don't If all tires are at 36 PSI, and the light is still on there is a malfunction. The system will need checked for codes with a scan tool.
Tire Pressure Monitoring System Tire Pressure Monitoring System
po 170 fuel trim malfunction bank 1for 1996 Mazda protege
Many other options. No fuel pressure, broken timing belt, computer malfunction, no spark,
P0300 is multiple or random cylinder misfire. No start can be dead battery, failed starter, no fuel, no fuel pressure, computer or sensor malfunction, internal engine failure, etc.
You can not turn off the tire pressure monitoring system if that is what you are asking.You can not turn off the tire pressure monitoring system if that is what you are asking.
Low tire pressure or tire pressure system malfunction
A malfunction indicator light comes on because a detector elsewhere in the item has noticed a malfunction in whatever it is monitoring.