AutoCodes – Honda – P0304 2017 Honda CR-V

P0304 2017 Honda CR-V Code - No. 4 Cylinder Misfire Detected

Quick Answer

The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #4, Faulty ignition coil #4. 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: P0304 2017 Honda CR-V indicates No. 4 Cylinder Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty spark plug #4, Faulty ignition coil #4.
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 497

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 Aug 16, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0304 2017 Honda CR-V Description

The crankshaft vibrates slightly when each cylinder fires. If a misfire occurs, the crankshaft rotation speed changes rapidly. The Powertrain Control Module (PCM) monitors the crankshaft rotation speed based on the output pulses from the Crankshaft Position (CKP) Sensor. By monitoring changes in the crankshaft rotation speed, the PCM counts the number of misfires and determines which cylinder is misfiring. If a misfire is detected, a Diagnostic Trouble Code (DTC) is stored.
There are two types of misfire detection: Type 1: When the number of misfires per 200 engine revolutions reaches the level that can damage the three-way catalyst (TWC), a DTC is stored and the MIL blinks. Type 2: When the number of misfires per 1,000 engine revolutions reaches the level that affects exhaust emissions but is not severe enough to immediately damage the catalyst, a DTC is stored, and the MIL comes on.

OBDII Code P0304 2017 Honda CR-V - No. 4 Cylinder Misfire Detected - AutoCodes.com — P0304 2017 Honda CR-V Code - No. 4 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0304 2017 Honda CR-V?

Valve adjustment
Faulty spark plug #4
Faulty ignition coil #4
Clogged or faulty fuel injector #4
Intake air leak
Insufficient cylinder #4 compression
Incorrect fuel pressure

How to Fix the DTC P0304 2017 Honda CR-V?

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 does this mean?

Code Tech Notes

The P0304 code means that cylinder #4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #4. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0304 2017 Honda CR-V 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 P0304 2017 Honda CR-V code?

Need more information on how to fix the P0304 2017 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0304 2017 Honda CR-V Code

1. What does the OBDII code P0304 mean on a 2017 Honda CR-V?

P0304 indicates that the engine control module (ECM) has detected a misfire in cylinder number 4.

2. What are the common symptoms of P0304 in a 2017 Honda CR-V?

Symptoms may include rough idling, reduced engine performance, poor acceleration, a flashing check engine light, and increased fuel consumption.

3. What causes the P0304 code on a 2017 Honda CR-V?

Common causes include a faulty spark plug, a damaged ignition coil, low cylinder compression, a clogged fuel injector, or a vacuum leak near cylinder 4.

4. Can I drive my 2017 Honda CR-V with a P0304 code?

Driving with a P0304 code is not recommended as it can cause further damage to the engine or catalytic converter if the misfire is severe.

5. How do I diagnose the P0304 code on a 2017 Honda CR-V?

Start by inspecting the spark plug and ignition coil for cylinder 4. Check for vacuum leaks, test the fuel injector, and perform a compression test on the cylinder.

6. How do I fix the P0304 code on a 2017 Honda CR-V?

Repairs may include replacing the spark plug or ignition coil for cylinder 4, cleaning or replacing the fuel injector, repairing vacuum leaks, or addressing low compression issues.

7. How much does it cost to fix the P0304 code on a 2017 Honda CR-V?

The cost depends on the issue. Replacing a spark plug or ignition coil may cost $100-$300, while repairing fuel injectors or addressing compression problems can cost significantly more.

8. Can a clogged fuel injector cause the P0304 code on a 2017 Honda CR-V?

Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 4, resulting in a misfire.

9. Will a bad ignition coil cause the P0304 code on a 2017 Honda CR-V?

Yes, a failing ignition coil for cylinder 4 can lead to a weak or nonexistent spark, causing a misfire and triggering the P0304 code.

10. How do I reset the check engine light after fixing the P0304 code on a 2017 Honda CR-V?

You can reset the check engine light by using an OBDII scanner to clear the code, or by disconnecting the battery for a few minutes. Ensure the issue is fully resolved before resetting.