Oil Pressure Switch Fault
Table of contents
C1284 MERCURY Possible Causes
- Faulty Oil Pressure Switch
- Oil Pressure Switch harness is open or shorted
- Oil Pressure Switch circuit poor electrical connection
How do I fix code C1284 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- The C1284 could be set if the engine oil is changed with the ignition key in the ON position.
Cost of diagnosing the C1284 MERCURY code
The cost of diagnosing the C1284 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C1284 MERCURY Description
The engine oil pressure switch is a normally open switch. When the oil pressure is within normal ranges, the engine oil pressure switch closes and sends a ground signal to the instrument cluster setting the oil pressure gauge to the normal or mid-range position. When the oil pressure is low, the engine oil pressure switch opens, removing the ground signal, and the instrument cluster commands the oil pressure gauge to the L (low) position.