OBD Guide
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B1225

Open In The In-Car Temperature Sensor Circuit

B1225 is an OBD-II diagnostic trouble code meaning: Open In The In-Car Temperature Sensor Circuit. Common causes: broken or damaged wiring, oxidation of sensor contacts. Estimated repair cost: $33–89.

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

Symptoms

  • Incorrect operation of climate control
  • Automatic system maintains only one temperature
  • Lack of response to temperature adjustments

Causes

  • Broken or damaged wiring
  • Oxidation of sensor contacts
  • Temperature sensor malfunction
  • Problems with the sensor connector

How to Fix

  1. Check the integrity of the sensor circuit
  2. Inspect contacts and connectors for oxidation
  3. Replace temperature sensor if necessary
  4. Clean or replace damaged wires

Related codes

B1224B1226

FAQ

What does the B1225 code mean?

B1225 is an OBD-II diagnostic trouble code that indicates: Open In The In-Car Temperature Sensor Circuit

What causes a B1225 error code?

The most common causes of B1225 include: Broken or damaged wiring; Oxidation of sensor contacts; Temperature sensor malfunction; Problems with the sensor connector.

How do I fix a B1225 diagnostic trouble code?

To fix B1225: Check the integrity of the sensor circuit. Inspect contacts and connectors for oxidation. Replace temperature sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1225?

Limited driving only, diagnose soon

How much does it cost to fix B1225?

The estimated repair cost for B1225 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat