You can't. Take it to Precision Tune or the Ford Dealer to get it done. They have codes you cannot know. Who wants car thieves running around with programming codes??!!
It's a touchy and intricate process. Look in your owner's manual.
The 2003 Ford Focus has 16 valves.
The 2003 Ford Focus has a 5-speed manual.
The 2003 Ford Focus is a gas-powered vehicle.
The 2003 Ford Focus has an inline 4 engine.
The curb weight of the 2003 Ford Focus is 2598 lbs..
The 2003 Ford Focus runs on regular unleaded.
The 2003 Ford Focus is 14 ft. 0.1 in. (168.1 in.) long.
The height of the 2003 Ford Focus is 4 ft. 8.3 in. (56.3 in.).
The 2003 Ford Focus has double overhead cam (DOHC).
The 2003 Ford Focus's turning circle is 34.3 ft..