4394666 | Genuine Cummins® Sensor Mounting Bracket For EPA17 15L ISX/QSX

• Holds the sensor firmly in place to prevent movement or vibration.

• Ensures the sensor is accurately positioned to take correct readings (e.g., temperature, pressure, exhaust flow).

• Protects the sensor from damage due to engine movement, heat, or road vibrations.

• Maintains alignment with the sensor's target area (such as an exhaust stream or fuel line).

1. Loose or Wobbly Sensor

The sensor shakes or moves when the engine is running.
Can cause intermittent signals or disconnections.
Often happens if the bracket is cracked, bent, or mounting bolts are missing or stripped.

2. Incorrect or Fluctuating Sensor Readings

The sensor gives inconsistent values, even though it tests as functional.
Can happen when the sensor is not aligned properly with the target area (e.g., misaligned O2 sensor or EGT sensor).
In emissions systems, this might trigger check engine lights or derating.

3. Sensor Touching Hot or Moving Parts

A failed bracket might let the sensor rest against the exhaust, turbo, or fan belts, leading to:
Burned wires
Melted sensor tips
Physical damage

4. Unusual Vibrations or Rattling Noise

A broken or loose bracket can cause rattling, especially at certain RPMs.
May sound like metal-on-metal or loose parts in the engine bay or exhaust system.

5. Visible Damage

Cracks, rust, bending, or broken welds on the bracket.
Missing mounting bolts or damaged bolt holes.
Corrosion (especially near exhaust systems) can weaken the bracket over time.

6. Frequent Sensor Failures

Replacing the same sensor multiple times? The problem may not be the sensor — a bad bracket could be causing physical or thermal stress on it.