AutoCodes – Generic – P1204

P1204 Code - Fuel System Failure Caused No. 4 Cylinder Misfire

Quick Answer

P1204 indicates Fuel System Failure Caused No. 4 Cylinder Misfire. Common causes include Ignition spark, Check primary and secondary ignition, Check fuel 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: P1204 indicates Fuel System Failure Caused No. 4 Cylinder Misfire.
Common causes: Common causes include Ignition spark, Check primary and secondary ignition, Check fuel 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.

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Code Popularity 32,360

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1204 Description

OBDII Code P1204 - Fuel System Failure Caused No. 4 Cylinder Misfire - AutoCodes.com — P1204 Code - Fuel System Failure Caused No. 4 Cylinder Misfire

What does this mean?

What are the Possible Causes of the DTC P1204?

Ignition spark
Check primary and secondary ignition
Check fuel system
Fuel pressure and injector
Check for vacuum leaks
Check engine mechanical condition

How to Fix the DTC P1204?

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 P1204 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 P1204 code?

Need more information on how to fix the P1204 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1204 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1204 Acura — Fuel System Failure Caused No. 4 Cylinder Misfire
P1204 Audi — Fuel Injector Circuit Cylinder 4 Electrical Malfunction
P1204 Honda — Fuel System Failure Caused No. 4 Cylinder Misfire
P1204 Isuzu — Injector Circuit Open / Shorted Cylinder #4
P1204 Jaguar — Fuel Injector Circuit Cylinder 4 Electrical Malfunction
P1204 Volkswagen — Fuel Injector Circuit Cylinder 4 Electrical Malfunction

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 P1204 Code

1. What are the common symptoms of OBDII code P1204 (Fuel System Failure Caused No. 4 Cylinder Misfire)?

- Common symptoms include rough idling, loss of power, engine misfires, increased fuel consumption, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1204?

- The code P1204 can be caused by issues such as a faulty fuel injector, a vacuum leak, a clogged fuel filter, a malfunctioning fuel pump, or problems with the ignition system.

3. How can I diagnose the root cause of OBDII code P1204?

- Diagnosis typically involves conducting a thorough inspection of the fuel system components, checking for vacuum leaks, testing the fuel injectors, performing a fuel pressure test, and inspecting the ignition system for any faults.

4. Can a clogged fuel filter trigger OBDII code P1204?

- Yes, a clogged fuel filter can restrict fuel flow to the No. 4 cylinder, leading to a lean or rich condition that may cause misfires and trigger the P1204 diagnostic trouble code.

5. Are there any quick repair tips for addressing OBDII code P1204?

- Quick repair tips may include checking and replacing the fuel filter, inspecting and cleaning the fuel injectors, ensuring proper fuel pressure, and performing a tune-up to address any ignition system issues.

6. Is it safe to continue driving with OBDII code P1204 present?

- It is not recommended to continue driving with code P1204 present, as unresolved fuel system issues can lead to further engine damage and potential safety hazards.

7. Can a DIY enthusiast fix OBDII code P1204 at home?

- Depending on the underlying cause, a DIY enthusiast with the necessary tools and knowledge may be able to address code P1204 by inspecting and replacing faulty components in the fuel system.

8. How much can I expect to spend on repairs for OBDII code P1204?

- Repair costs for OBDII code P1204 can vary depending on the specific cause and the extent of the required repairs, but expenses may range from a few hundred to over a thousand dollars.

9. Will resetting the check engine light erase OBDII code P1204?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue causing code P1204 is not addressed, the code is likely to reappear after driving the vehicle for a certain period.

10. Can a misfire in the No. 4 cylinder be caused by issues unrelated to the fuel system?

- Yes, misfires in the No. 4 cylinder can also be caused by problems such as faulty spark plugs, a malfunctioning ignition coil, engine timing issues, or compression problems in the cylinder.