If you're having trouble starting your 2003 Windstar, and suspect the anti-theft system is the culprit, here's what you should do, in order of likelihood:
1. Check your key: This is the most common cause. Ensure you're using the correct key. Try all keys that came with the vehicle. If you only have one key, and it's damaged, that's likely the problem.
2. Key Battery: If your key has a remote (for locking/unlocking), a dead battery can sometimes interfere with the transponder signal. Replace the battery in your key fob.
3. Battery Voltage: A weak car battery can sometimes cause the anti-theft system to act up. Have the battery tested at an auto parts store. A low voltage reading could be the problem. Jump starting might temporarily solve it to get you to a shop to get a battery test.
4. PATS System Issues (Passive Anti-Theft System): This is the actual integrated anti-theft system in your Windstar. Problems here are more complex and usually require a dealer or specialized auto locksmith. Issues can include:
* Faulty Ignition Switch: A worn or damaged ignition switch can prevent the system from reading the key properly.
* Faulty Receiver: The receiver that reads the transponder chip might be malfunctioning.
* Wiring Issues: Damaged or corroded wiring can disrupt the signal between the key and the vehicle's computer.
* Computer Problems (PCM): In rare cases, the Powertrain Control Module (PCM) itself might have a problem interfering with the anti-theft system.
Do NOT attempt to bypass or disable the anti-theft system yourself unless you're a qualified mechanic. Improper attempts can damage your vehicle's electrical system or even make the situation worse.
If none of the above steps work, you'll need professional help. A qualified mechanic or locksmith specializing in automotive security systems will have the tools and knowledge to diagnose the problem and either reprogram the keys, repair the faulty component, or replace it. They may even need to access the vehicle's computer to troubleshoot the system properly. Expect this to be more expensive than simply replacing a battery.
