OBD Guide
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C1284

Oil Pressure Switch Fault

C1284 is an OBD-II diagnostic trouble code meaning: Oil Pressure Switch Fault. Common causes: open or short circuit in the sensor circuit, oil pressure sensor malfunction. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • Oil pressure indicator is on
  • Unstable engine operation
  • False oil pressure readings on the dashboard

Causes

  • Open or short circuit in the sensor circuit
  • Oil pressure sensor malfunction
  • Poor contact in the sensor connector
  • Wiring Harness Problems

How to Fix

  1. Check the continuity of the oil pressure sensor circuit
  2. Check the contacts in the sensor connector
  3. Replace oil pressure sensor if necessary
  4. Check wiring harness for damage

Related codes

P0520P0521P0522

FAQ

What does the C1284 code mean?

C1284 is an OBD-II diagnostic trouble code that indicates: Oil Pressure Switch Fault

What causes a C1284 error code?

The most common causes of C1284 include: Open or short circuit in the sensor circuit; Oil pressure sensor malfunction; Poor contact in the sensor connector; Wiring Harness Problems.

How do I fix a C1284 diagnostic trouble code?

To fix C1284: Check the continuity of the oil pressure sensor circuit. Check the contacts in the sensor connector. Replace oil pressure sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1284?

Limited driving only, diagnose soon

How much does it cost to fix C1284?

The estimated repair cost for C1284 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat