Ignition Key Lock Cylinder Sensor

1998 Mercury Mountaineer 5.0 P, AWDSECTION Ignition Key Lock Cylinder Sensor
WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Unplug RAP module. Module is located above and to rear of left rear wheelwell. Measure resistance between pins No. 14 (Black/White wire) and No. 17 (Dark Green/White wire) at harness connector. If resistance is not 145-175 ohms, replace lock cylinder sensor, or repair Dark Green/White and/or Black/White wire. See WIRING DIAGRAMSΒ  .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.