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.
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HOMESERVICE MANUALSMERCURY2010MARINER PREMIER, 2.5 7, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P1900: OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT INTERMITTENT
2010 Mercury Mariner Premier, 2.5 7, FWD
DTC P1900: Output Shaft Speed (OSS) Sensor Circuit Intermittent
2010 Mercury Mariner Premier, 2.5 7, FWDSECTION DTC P1900: Output Shaft Speed (OSS) Sensor Circuit Intermittent
DTC P1900: OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT INTERMITTENT
| Description: | The OSS sensor signal to the powertrain control module (PCM) is irregular or interrupted. | ||
| Possible Causes: |
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| Diagnostic Aids: | Verify harness and connector integrity. Verify correct installation of the OSS sensor. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Manual Transmission | GO to PINPOINT TEST DP . | ||
| Automatic Transmission | Refer to the Pinpoint Test Output Shaft Speed Sensor in the appropriate AUTOMATIC TRANSMISSION/TRANSAXLE article to continue diagnosis. | ||
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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.