AutoCodes – Mazda – P0204 Mazda

P0204 Mazda Code - Injector Circuit Open Cylinder 4

Quick Answer

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. Common causes include Faulty fuel injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector #4 circuit poor electrical connection. 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: P0204 Mazda indicates Injector Circuit Open Cylinder 4.
Common causes: Common causes include Faulty fuel injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector #4 circuit poor electrical connection.
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 8,192

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0204 Mazda Description

Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0204 code when the resistance or voltage drop at the injector 4 is out of specifications.

OBDII Code P0204 Mazda - Injector Circuit Open Cylinder 4 - AutoCodes.com — P0204 Mazda Code - Injector Circuit Open Cylinder 4

What does this mean?

What are the Possible Causes of the DTC P0204 Mazda?

Faulty fuel injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector #4 circuit poor electrical connection

How to Fix the DTC P0204 Mazda?

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 P0204 Mazda 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 P0204 Mazda code?

Need more information on how to fix the P0204 Mazda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0204 Mazda 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 P0204 Mazda Code

1. What are common symptoms of OBDII code P0204 (Injector Circuit Open Cylinder 4) in a Mazda?

- Common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P0204 in a Mazda?

- The code P0204 typically indicates an issue with the fuel injector circuit in cylinder 4, which can be caused by a faulty fuel injector, wiring problems, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P0204 in my Mazda?

- Diagnosing the issue may involve checking the wiring harness for damage, testing the fuel injector for proper functionality, and using a scan tool to analyze the ECM's input and output signals related to the fuel injector in cylinder 4.

4. Can a DIY enthusiast repair OBDII code P0204 in a Mazda?

- While some basic troubleshooting like checking for loose connections or damaged wires can be done by a DIY enthusiast, diagnosing and repairing the root cause of the issue may require professional expertise and specialized tools.

5. What are the potential risks of driving with OBDII code P0204 unresolved in a Mazda?

- Driving with the code P0204 unresolved can lead to worsened engine performance, increased emissions, and potential damage to the catalytic converter over time.

6. How much does it typically cost to repair OBDII code P0204 in a Mazda?

- The cost of repairing OBDII code P0204 can vary depending on the underlying cause. Replacing a faulty fuel injector or repairing wiring issues may cost a few hundred dollars, while addressing ECM problems could be more expensive.

7. Are there any preventive measures to avoid OBDII code P0204 in a Mazda?

- Regular maintenance, such as fuel injector cleaning and inspection of wiring harnesses, can help prevent issues that may trigger OBDII code P0204 in a Mazda.

8. Can a bad fuel injector cause OBDII code P0204 in a Mazda?

- Yes, a faulty fuel injector in cylinder 4 can cause OBDII code P0204 to appear, indicating an open circuit issue with the injector.

9. Is it safe to drive my Mazda with OBDII code P0204 if the engine is running smoothly?

- It is not recommended to drive with OBDII code P0204 even if the engine seems to be running smoothly, as unresolved issues can lead to more severe problems down the road.

10. How long does it typically take to repair OBDII code P0204 in a Mazda at a professional auto repair shop?

- The repair time for OBDII code P0204 can vary depending on the exact cause of the issue, but it may take a few hours to a full day for a professional auto repair shop to diagnose and fix the problem.