Question about 2003 Ford Excursion

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Theft warning comes on and car won't turn over

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If I'm not mistaken this vehicles came with a special key that has a chip in it, the key head is bigger than normal. could be the key itself.

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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Security light on and won,t turn over engine to start . rolled car on to the roof on black ice. physically car looks ok


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Dec 26, 2015 | Cars & Trucks

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Yaris minor problem after accident/repair, dome light, key and headlight warning sound


Some body in the workshop may have switched the theft deterrent system from active to passive mode during the scanning process.
The theft deterrent system has two arming modes;
Active and Passive. Active arming mode allows the
theft deterrent system to activate normally. Passive
arming mode is used for the servicing. The
intelligent tester allows the theft deterrent system to
switch between Active and Passive.
If the problem persists contact other qualified personnel.

Oct 27, 2014 | 2008 Toyota Yaris

1 Answer

2003 Mercury Sable when apply brakes hard theft light comes on


check the over load circuit breaker for the lights going out. Run fault codes to find the ABS/ Traction control sensor problem

Feb 16, 2014 | 2001 Mercury Sable

1 Answer

2004 cavalier won't start, need to reset anti-theft


the way i reset the antitheft is to put the key in the ignition and turn it on till all the dash lights come on but dont start it let it sit 15 minutes turn the key off and turn it on again till all the lights come on again repeat this procedure three times after the third time turn the key off for about 5 seconds and then your car should start hope this helps.

Mar 30, 2013 | 2004 Chevrolet Cavalier

1 Answer

Citroen c3 2006 anti-theft


I had the same problem.when I used my main key my car wouldn't start and I got the message "anti theft faulty". The key and the remote still unlocks and locks the doors and turns the lights on/off but it just wouldn't start my car. I was able to start my C3 by using the spare key. The main key is still faulty and if used brings up the same message.

Oct 30, 2012 | Citroen Agusta F4 R312 1 plus 1 Cars &...

1 Answer

06 trailblazer trouble with anti theft system, I think, starts right up then other times the anti theft light comes on and it won't start. can try it 2-4 hours later and it starts right up????


The first thing to do get it checked for DTC'S - diagnostic trouble codes . Not at auto zone or any other parts store , you want to have full scan of all the modules on the car. Don't know how much you know about automotive electronics , computer controlled systems etc.... Your vehicle has at least 10 modules (computers ) on board , there all talk to each other on a serial data network . C.A.N - controller area network . Or in the case of GM it has it's own . GMLAN -
How to Diagnose Controller Area Network CAN When you turn that ignition switch to start it is an input to the computer ,be it the PCM or BCM ..

Jul 01, 2017 | 2004 Chevrolet TrailBlazer

1 Answer

Replaced ignition switch in 1999 chevy cavaliar rs, anti-theft light comes on and stays on and won't allow car to start and remain on or run


You have to do a relearn procedure on the anti-theft system:

Attempt to start the vehicle. Leave the ignition on until the THEFT SYSTEM indicator turns off (about 10 minutes). Turn the ignition switch off. Leave the ignition switch off with key in for about 10 minutes. Attempt to start vehicle.

May 24, 2011 | 1996 Chevrolet Cavalier

3 Answers

Can you bypass theft system


No, I think he has the same problem I do. I have a stock 99 malibu...no real theft system. Usually after it rains or gets cold, a "theft system" light comes on in my dash. I can be driving, and the light will come on. If I turn the car off, I cannot restart the vehicle till about 20 minutes have passed and the light finally goes off. Sometimes this light comes on when I try to start the car in the morning. I put the key in the ignition, and the car will not start for 20 minutes till the darn theft system light goes off. From what I gathered, the theft system issue has something to do with a "passlock II" defect. I have no idea what this is, all I know is that I can't get a mechanic to listen to me, because the issue never repeats itself when I go to a garage. It gets a little annoying, but I've learned to deal with it.

Sep 10, 2008 | 1999 Chevrolet Malibu

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