AutoCodes – Subaru – P1492 Subaru

P1492 Subaru Code - EGR Signal Line 1 Circuit Low

Quick Answer

P1492 Subaru indicates EGR Signal Line 1 Circuit Low. Common causes include Faulty EGR valve, EGR valve harness is open or shorted, EGR valve circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P1492 Subaru indicates EGR Signal Line 1 Circuit Low.
Common causes: Common causes include Faulty EGR valve, EGR valve harness is open or shorted, EGR valve circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 15,135

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1492 Subaru Description

OBDII Code P1492 Subaru - EGR Signal Line 1 Circuit Low - AutoCodes.com — P1492 Subaru Code - EGR Signal Line 1 Circuit Low

What does this mean?

What are the Possible Causes of the DTC P1492 Subaru?

Faulty EGR valve
EGR valve harness is open or shorted
EGR valve circuit poor electrical connection

How to Fix the DTC P1492 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1492 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1492 Subaru code?

Need more information on how to fix the P1492 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1492 Subaru code diagnosed by a professional: Find a repair shop in your area

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 P1492 Subaru Code

1. What does the Subaru OBDII code P1492 mean?

P1492 indicates an issue with the EGR (Exhaust Gas Recirculation) system, specifically that the EGR Signal Line 1 Circuit is experiencing a low voltage condition.

2. What are the common symptoms of code P1492 in a Subaru?

Symptoms may include a check engine light, reduced fuel efficiency, rough idling, poor acceleration, or increased emissions.

3. What causes the EGR Signal Line 1 Circuit Low (P1492) code in a Subaru?

Common causes include a faulty EGR valve, damaged wiring or connectors in the EGR circuit, a clogged EGR passage, or a malfunctioning EGR sensor.

4. Can I still drive my Subaru with a P1492 code?

While the car may still drive, it could experience performance issues and emit higher emissions. Prolonged driving without addressing the issue may cause further engine damage.

5. How do I diagnose the P1492 code on my Subaru?

Diagnosis involves inspecting the EGR valve for proper function, checking the wiring and connectors for damage, and testing the EGR sensor and circuit for voltage irregularities.

6. How is the P1492 code fixed in a Subaru?

Repairs may include replacing the EGR valve, cleaning clogged EGR passages, repairing or replacing damaged wiring, or replacing a faulty EGR sensor.

7. Can a dirty EGR valve cause the P1492 code?

Yes, a dirty or clogged EGR valve can restrict proper airflow and trigger the P1492 code due to low signal voltage.

8. Does clearing the P1492 code with a scan tool fix the problem?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

9. How much does it cost to repair a P1492 code on a Subaru?

The cost varies depending on the root cause, ranging from $100 to $500 or more. Cleaning the EGR valve is less expensive, while replacing components like the EGR sensor or valve can be costlier.

10. Can a bad PCM cause the P1492 code on a Subaru?

While rare, a malfunctioning Powertrain Control Module (PCM) could contribute to the P1492 code. However, this is typically a last resort after all other possibilities have been ruled out.