* Vehicle Speed Sensor (VSS): This sensor is crucial for many systems. If it fails, you'll likely experience:
* Speedometer Malfunction: The most obvious symptom – your speedometer will stop working or be wildly inaccurate.
* Odometer Malfunction: The odometer might also stop working or give erratic readings.
* Cruise Control Inoperative: Cruise control relies on the VSS to maintain speed.
* Transmission Problems: The transmission's computer uses the VSS signal for shifting. A faulty sensor can lead to rough shifting, delayed shifting, or even inability to shift gears properly. This is especially true for automatic transmissions.
* ABS Malfunction (if equipped): The anti-lock braking system may also malfunction as it uses the speed sensor data. The ABS light will likely illuminate.
* Check Engine Light: This is almost certain; the computer detects the lack of a proper signal.
* Transmission Speed Sensor: Some Ford Broncos of that era might also have a separate speed sensor for the transmission itself. This sensor's failure would primarily affect the transmission's operation, leading to similar symptoms as described above regarding rough shifting etc.
It's important to note that some symptoms might be subtle at first, gradually worsening as the sensor deteriorates. A complete failure will generally result in more noticeable problems. A mechanic can diagnose the specific failing sensor and replace it. Often, it's relatively inexpensive to repair.
