2002 seat leon 1.4 The engine warning light

Do a compression test. Your engine may need an overhaul.

Not surprisingly, many others have experienced problems with the ignition switch on this car. Historically, it is not a sound, but that the key is stuck in the ignition. http://repairpal.com/key-will-not-come-out-of-ignition-570 Your problem sounds different, but it may be related. Although I do not recommend the fix in the link above, it is possible the previous owner of your car did perform this fix and it has resulted in the problem you now have. My better guess is that the chime/buzzer has failed due to moisture or dirt and is no longer producing the sound that it should, but instead is altered to the ringing you describe.To disable follow these instructions:

1. Turn the ignition switch to the RUN (or ON) position. (DO NOT
START THE ENGINE)
2. Wait until the safety belt warning light turns off. (Approximately 1
minute)
Step 3 must be completed within 50 seconds after the safety belt
warning light turns off.
3. For the seating position being disabled, at a moderate speed, buckle
then unbuckle the safety belt 9 times, ending in the unbuckled state.
(Step 3 must be completed within 50 seconds after the safety belt
warning light turns off.)
After Step 3, the safety belt warning light will be turned on for three
seconds.
4. Within 10 seconds of the light turning on, at a moderate speed, buckle
then unbuckle the safety belt.
This will disable the BeltMinder feature for that seating position if it
is currently enabled. As confirmation, the safety belt warning light will
flash 4 times per second for 3 seconds.
This will enable the BeltMinder feature for that seating position if it
is currently disabled. As confirmation, the safety belt warning light will
flash 4 times per second for 3 seconds, followed by 3 seconds with the
light off, then followed by the safety belt warning light flashing 4 times
per second for 3 seconds again.
I hope this helps. Good luck.

The light is not due to any clogged filter issue, you have an engine fault in one of the sensors most likely.

U HAVE ACTIVATED SPEED WARNING!!USE MANUAL TO DEACTIVATE!!

Before you run aengine anymore remove the oil light switch and check it with a gauge in the oil light switch is faulty ,what engine is this a diesel or a petrol

replace the oil sensor and it should stop

if the engine is making a noise its most posibel there is no oil in car or oilpump is backed up

flashing dashboard lights when the ignition is turned off

From the F-150 Forums, since I just bought one and this worked!

This is straight from my 2009 f150 owners guide

Preperation
1. the parking brake is set
2. truck in park
3. ignition switch is in off position
4. both seat belts are unbuckled

Disable Belt-Minder
1. turn the ignition switch to the on position, DO NOT START THE ENGINE.
2. wait until the safety belt warning light turns off. (approximately 1 minute).
* step 3 must be completed within 50 secs after the safety belt warning light turns off.
3. buckle then unbuckle the seat belt nine times, ending in the seat belt unbuckled.
* after step 3 the restraint warning light, (airbag light) will turn on for three (3) seconds.
4. within approximately seven (7) seconds of the light turning off, buckle then unbuckle the safety belt.
* the restraint system warning light will flash four, (4) times per second for 3 seconds for confirmation

you can do this for the passenger side also!!!


*NOTE
in step 3. after three times buckling and unbuckling the restraint warning light lit up in my truck. SO I WENT TO THE NEXT STEP, (STEP 4). waited 3 seconds and i buckled and unbuckled.

in the buckle /unbuckle procedure do it some what slowly and watch for the light. it may not take 9 times.
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that is likely your check engine light... if you live near an autozone they can scan it for free to tell you what the problem is.