Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Ford Bronco Base, 4D Utility, 2.3L Eng VIN H, Part Time T/Case ControlFACTORY OEM SERVICE PROCEDURE
P1900 - Output Shaft Speed Sensor Circuit Intermittent
DTC DESCRIPTION P1900 - OUTPUT SHAFT SPEED SENSOR CIRCUIT INTERMITTENT
| Description: | This DTC sets when the OSS sensor signal to the PCM is irregular or interrupted. | ||
| Possible Causes: |
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| Diagnostic Aids: | Verify the OSS harness and connector integrity. Verify correct installation of the OSS sensor. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Manual Transmission | GO to Pinpoint Test DP. | ||
| Automatic Transmission | Refer to the appropriate Automatic Transmission article, Pinpoint Test Output Shaft Speed Sensor to continue diagnosis. | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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