OBD Guide
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B1389

Oil Temperature Sensor Circuit Failure

B1389 is an OBD-II diagnostic trouble code meaning: Oil Temperature Sensor Circuit Failure. Common causes: open or short circuit in the sensor circuit, oil temperature sensor malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Incorrect oil temperature readings on the dashboard
  • Engine performance deterioration
  • Increased fuel consumption

Causes

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

How to Fix

  1. Check the continuity of the oil temperature sensor circuit
  2. Inspect connectors and contacts for corrosion or damage
  3. Check the resistance of the oil temperature sensor
  4. Replace sensor if necessary
  5. Check wiring harness for damage
  6. Clean or replace connectors if necessary

Related codes

P0115P0117P0118

FAQ

What does the B1389 code mean?

B1389 is an OBD-II diagnostic trouble code that indicates: Oil Temperature Sensor Circuit Failure

What causes a B1389 error code?

The most common causes of B1389 include: Open or short circuit in the sensor circuit; Oil temperature sensor malfunction; Poor contact in the sensor connector; Wiring Harness Problems.

How do I fix a B1389 diagnostic trouble code?

To fix B1389: Check the continuity of the oil temperature sensor circuit. Inspect connectors and contacts for corrosion or damage. Check the resistance of the oil temperature sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1389?

Limited driving only, diagnose soon

How much does it cost to fix B1389?

The estimated repair cost for B1389 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat