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Engine-Codes – Saab – P1392 Saab

P1392 Saab Code - Cylinder 2 Misfire Detected Random Fuel Level Low

Quick Answer

The P1392 diagnostic trouble code (DTC) for Saab vehicles indicates a misfire in cylinder 2, detected at random with a low fuel level. Common causes include Faulty ignition coil or spark plug in cylinder 2, Clogged fuel injector in cylinder 2, Low fuel pressure in the fuel delivery system. 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
P1392 Saab indicates Cylinder 2 Misfire Detected Random Fuel Level Low.
Common causes
Common causes include Faulty ignition coil or spark plug in cylinder 2, Clogged fuel injector in cylinder 2, Low fuel pressure in the fuel delivery system.
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 10, 2024
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Code P1392 Saab Description

The P1392 diagnostic trouble code (DTC) for Saab vehicles indicates a misfire in cylinder 2, detected at random with a low fuel level. This code is typically associated with an issue that affects the combustion process in the specific cylinder, leading to a noticeable decrease in engine performance. When a misfire occurs, the air-fuel mixture in the affected cylinder fails to ignite properly, resulting in incomplete combustion. This can lead to a variety of issues such as rough idling, decreased power output, reduced fuel efficiency, and an overall decrease in engine performance.

OBDII Code P1392 Saab - Cylinder 2 Misfire Detected Random Fuel Level Low
P1392 Saab Code - Cylinder 2 Misfire Detected Random Fuel Level Low

Common Causes of P1392 Saab

  1. Faulty ignition coil or spark plug in cylinder 2
  2. Clogged fuel injector in cylinder 2
  3. Low fuel pressure in the fuel delivery system
  4. Vacuum leak affecting cylinder 2
  5. Mechanical issue in cylinder 2 such as low compression or valve problems

Symptoms of P1392 Saab

  1. Rough idling or engine vibrations
  2. Decreased acceleration and power
  3. Engine misfires or hesitation during acceleration
  4. Increased fuel consumption
  5. Illuminated check engine light

How to Fix P1392 Saab

  1. Diagnose the specific cause of the misfire by performing a thorough inspection of the ignition system, fuel delivery system, and cylinder 2 components.
  2. Replace faulty ignition coil or spark plug in cylinder 2 if necessary.
  3. Clean or replace clogged fuel injector in cylinder 2.
  4. Check and adjust fuel pressure in the fuel system to ensure proper delivery to cylinder 2.
  5. Address any vacuum leaks and perform a compression test on cylinder 2 to rule out any mechanical issues.

Cost to Fix P1392 Saab

The cost of repairing a cylinder 2 misfire detected with a low fuel level in a Saab vehicle can vary depending on the specific cause of the issue and the necessary repairs. In general, the cost of parts such as ignition coils, spark plugs, fuel injectors, and vacuum hoses can range from $50 to $200 each. Labor costs for diagnosing and repairing the issue can vary between $200 to $500, depending on the shop's hourly rate and the complexity of the repair. Overall, the total cost of resolving this issue could range from $300 to $1000. It is recommended to obtain a detailed estimate from a qualified mechanic to determine the exact cost for your specific vehicle.

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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 P1392 Saab Code

1. What does the OBDII code P1392 mean on a Saab?

The P1392 code in a Saab indicates that the engine control module (ECM) has detected a misfire in cylinder 2 and the fuel level is reported as low.

2. What are the symptoms of code P1392 in a Saab?

Symptoms may include rough idling, engine hesitation or stalling, a decrease in engine performance, and the Check Engine light being illuminated.

3. What could cause the P1392 code in a Saab?

Possible causes include low fuel level, faulty spark plugs or wires, a bad ignition coil, issues with the fuel injector, or a compression problem in cylinder 2.

4. How can I fix the P1392 code on a Saab?

To fix this code, start by checking the fuel level and refilling if necessary. Inspect the spark plugs, ignition wires, and coils for damage or wear. Also, check the fuel injector for proper operation. It may be necessary to perform a compression test to diagnose further.

5. Is it safe to drive a Saab with code P1392?

Driving with an active misfire can cause further damage to the engine and other components like the catalytic converter. It is advisable to address the issue promptly to avoid additional repairs.

6. How do I diagnose a P1392 code in a Saab?

Begin by using an OBDII scanner to confirm the code. Check the fuel level and inspect the ignition components specific to cylinder 2, including spark plugs, wires, and coil. Also, test the fuel injector functionality and check for any compression issues in the cylinder.

7. What tools are needed to diagnose the P1392 code in a Saab?

You will need an OBDII scan tool, a multimeter, and possibly a compression tester to diagnose this issue effectively. Basic hand tools may also be needed to access and inspect various components.

8. Can a low fuel level trigger the P1392 code in a Saab?

Yes, a significantly low fuel level can contribute to engine misfire conditions, which might trigger the P1392 code. Ensuring a proper fuel level can help in preventing misfires related to fuel supply.

9. What should I check first if my Saab shows the P1392 code?

First, ensure that the fuel tank is adequately filled. Then, inspect the spark plug and ignition coil for cylinder 2. These are common culprits for misfires and are relatively straightforward to check and replace if necessary.

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