They can be located anywhere on the vehicle, most commonly under the dash or in the engine compartment

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I have a feeling that the 'cofre' might not be inside the car.

Check wiring between the 68-pin gearbox control unit and the gearbox
carry out, if:
t the final control diagnosis or
t the electrical test points to faults in or between gearbox and automatic gearbox control unit -J217 -.
Test requirements:
t Ignition off.
t Connect test box e.g. -V.A.G 1598/18- only to 68-pin connector of gearbox wiring harness.

http://workshop-manuals.com/skoda/octavia-mk1/power_transmis...

Vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3, 3A, 3B oder 3C-
t Test box -V.A.G 1598/31-
t Handheld multimeter, e.g. -V.A.G 1526 A-
t Measuring tool set e.g. -V.A.G 1594 A, B oder C-

http://workshop-manuals.com/skoda/fabia-mk1/engine/2.0/85_en...

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Note added at 10 hrs (2016-02-09 23:02:37 GMT)
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I've since found 'cofre' is used to refer to engine bay.

Maria apparently forgot to tell you that "Cofre" is also a very common term for the engine bay in a car/truck, etc. And the trunk of a car is called "La cajuela."

http://www.spanishdict.com/answers/192381/bal-vs-cofre

SV COBERTURA DO COFRE DO MOTOR INT. TRAS
02 SV ENGINE COMPARTMENT COVERING, REAR COMPARTMENT

http://mercedes-benz-teile.info/view_SubGroupAction.php?lang...

My comment about engines being hidden under covers made me search for the term with different keywords. Because I've given an answer, I can't post a reference but if you search for 'debajo del cofre' you'll see it can refer to a vehicle's engine bay/compartment.

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Note added at 10 hrs (2016-02-09 23:15:26 GMT)
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"Cofre" is the engine bay and "capó" is the hood covering the engine bay, although in México when we say "Abre el cofré", we really mean "open the hood" and not the entire engine bay. And KiwiGirl is right - it´s regional usage.

http://www.spanishdict.com/answers/243811/again-about-cars