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P1312 Subaru Code - Exhaust Temperature Sensor Malfunction

Quick Answer

The P1312 Subaru code indicates a malfunction in the exhaust temperature sensor. Common causes include Sensor degradation over time, Exposure to extreme temperatures, Contamination from exhaust gases. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1312 Subaru indicates Exhaust Temperature Sensor Malfunction.
Common causes
Common causes include Sensor degradation over time, Exposure to extreme temperatures, Contamination from exhaust gases.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1312 Subaru Description

The P1312 Subaru code indicates a malfunction in the exhaust temperature sensor. This sensor plays a crucial role in monitoring the temperature of the exhaust gases leaving the engine. The data collected by the sensor is used by the engine control module (ECM) to optimize fuel mixture, emission control, and overall engine performance. When the exhaust temperature sensor malfunctions, it can lead to a variety of issues that affect the vehicle's performance and emissions.

OBDII Code P1312 Subaru - Exhaust Temperature Sensor Malfunction
P1312 Subaru Code - Exhaust Temperature Sensor Malfunction

Common Causes of P1312 Subaru

  1. Sensor degradation over time
  2. Exposure to extreme temperatures
  3. Contamination from exhaust gases
  4. Wiring or connectivity issues
  5. ECM malfunction

Symptoms of P1312 Subaru

  1. Check engine light illuminated on the dashboard
  2. Decreased fuel economy
  3. Reduced engine performance
  4. Failed emissions tests
  5. Rough idling or stalling

How to Fix P1312 Subaru

  1. Use an OBD-II scanner to read and clear the fault code from the ECM.
  2. Inspect the exhaust temperature sensor for any signs of damage or contamination.
  3. Test the sensor's resistance and voltage output to determine if it is functioning correctly.
  4. Replace the exhaust temperature sensor if it is found to be faulty.
  5. Clear the fault code from the ECM memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1312 Subaru

The typical repair costs for a malfunctioning exhaust temperature sensor can range from $150 to $400, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for a more accurate estimate. Keep in mind that rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower prices.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1312 Subaru Code

1. What does the OBDII code P1312 mean on a Subaru?

P1312 indicates an Exhaust Temperature Sensor Malfunction, meaning the sensor is not providing accurate data to the engine control module (ECM).

2. What are the symptoms of the P1312 code on a Subaru?

Common symptoms include reduced fuel efficiency, engine misfires, poor performance, and the check engine light illuminating.

3. What causes the P1312 code to appear on a Subaru?

Potential causes include a faulty exhaust temperature sensor, damaged wiring or connectors, excessive soot buildup, or an issue with the ECM.

4. Can I drive my Subaru with the P1312 code?

Driving with this code is not recommended as it may cause further damage to the exhaust system or catalytic converter if left unresolved.

5. How do I diagnose the P1312 code on a Subaru?

Start by inspecting the exhaust temperature sensor and its wiring for damage or corrosion. Use a multimeter to test the sensor’s resistance and compare it to manufacturer specifications.

6. How do I fix the P1312 code on a Subaru?

Repairs may include replacing the exhaust temperature sensor, repairing damaged wiring, cleaning soot buildup, or reprogramming the ECM if necessary.

7. Where is the exhaust temperature sensor located on a Subaru?

The sensor is typically located near the exhaust manifold or catalytic converter, depending on the model.

8. What tools are needed to fix the P1312 code on a Subaru?

You may need a diagnostic scanner, multimeter, socket wrenches, and possibly a replacement exhaust temperature sensor.

9. How much does it cost to fix the P1312 code on a Subaru?

The cost can range from $150 to $400, depending on whether only the sensor needs replacement or additional repairs are required.

10. Can a faulty exhaust temperature sensor damage my Subaru’s engine?

While it won’t directly harm the engine, ignoring the issue can lead to overheating or damage to the catalytic converter over time.

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