2003 Ford Focus - Answered Questions & Fixed issues

Did you check to see if the brake fluid is topped up?

Question edited for clarity and spelling. Question moved to model category. Check out the link https://www.google.com/search?q=2003+ford+focus+replace+purge+valve+solenoid ..

Engine light on? Anti-theft light flashing? Did you disconnect the battery? Have you checked for DTC codes?

The MAF (mass air flow sensor)? https://www.google.com/search?q=2003+ford+focus+zx3+maf+wiring+diagram ..

My dad had this problem for years. He always cleared it out when the engine misfired. Ford did not want to know. Garages did not want to look.
Eventually i found someone who had seen it before.
Along side each pair of plugs there is a 'core plug' sitting at the bottom (some Focus's have a sort of big grub screw instead). These get pourous or holed letting coolant out.
It is hard to see these things as they will be under a layer of 'silt'.
New core plus fitted and job done. No problem for 6 months now.

Yup, been there, done that. Found it was a bad injector. Replaced that one injector the test showed and runs great now. Check engine light should be on though because of this problem. The test will show you which cylinder is misfiring and that is the injector you change. My test showed #5 cylinder. The last # in the code read.

Try this There are a few possible ways to reset the Ford Focus anti-theft security system. One way is to put the physical key in the lock, and then turn it to the unlock position. Do this, without moving it away from that unlock position for about 30 seconds. After that, You can unlock the car and start the engine.

What is the ford focus security system reset procedure?

Videos as well https://www.google.com/search?q=2003+ford+focus+security+reset ..

interior engine problem most probably head gasket, sorry

You are most likely to have earthing or resistance issues. Funnily enough, I just watched this video last night. You will see the dim headlight scenario mentioned towards the end on a vehicle, but you need to know the testing procedure first. You will also need a digital multimeter. Or, you can just take it to an auto-electrician. https://www.youtube.com/watch?v=YaYtCVBodpw ..

I assume you think the transmission will not go into overdrive. Either the torque converter clutch solenoid has failed, is stuck or is not receiving the signal to activate from the control computer (may be a wiring problem). You can check with a good code reader if there is an error code, and if a signal is being sent to the transmission by using the code reader in live view, but troubleshooting the solenoid should be left to a transmission repair shop as the oil pan must be dropped to get at it.

Try here for for Ford Codes - its a recommended site Ford Radio Codes

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Check vacuum hoses going to the IMRC for leaks

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Take the numbers from the sticker, the VIN code and proof of ownership to a dealer to get the code. They won't do this over the phone. I hope this helps, Take care

https://www.aa1car.com/library/troubleshoot_antitheft_system.htm

Please visit here & for a nominal amount recover your code.

This light is for multi funtion automatic transmisson cooling system