* Try the other keys: If you have multiple keys, try each one. Sometimes keys get damaged or the transponder chip malfunctions.
* Check the battery in your key fob (if applicable): A weak battery in the key fob can interfere with the signal. Replace the battery if necessary. This is especially important for keys with remote unlocking features.
* Check the key itself: Make sure the key is not damaged or bent in a way that affects the transponder chip within it.
* Try inserting and removing the key several times: Sometimes a simple reseat can re-establish communication.
* Try a different ignition cylinder: (This is NOT a DIY task for most people and could permanently damage your car) If you've tried all the above, the problem might be with the ignition cylinder itself. This is a complex repair best left to a qualified locksmith or mechanic.
* Call a locksmith or tow service: If none of the above works, you'll likely need a locksmith specializing in automotive security. They can often bypass the PATS system or replace the ignition cylinder. A tow truck might be necessary if the car is in a dangerous or inconvenient location.
Important Note: Attempting to bypass the PATS system yourself, without proper knowledge and tools, can cause more damage and may void your insurance. It's always best to contact a professional for assistance with anti-theft issues.