AutoCodes – Honda – P0303 2018 Honda CR-V

P0303 2018 Honda CR-V Code - No. 3 Cylinder Misfire Detected

Quick Answer

The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #3, Faulty ignition coil #3. 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: P0303 2018 Honda CR-V indicates No. 3 Cylinder Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty spark plug #3, Faulty ignition coil #3.
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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

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

Code Popularity 442

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
Add Comment

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

Code P0303 2018 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 P0303 2018 Honda CR-V - No. 3 Cylinder Misfire Detected - AutoCodes.com — P0303 2018 Honda CR-V Code - No. 3 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0303 2018 Honda CR-V?

Valve adjustment
Faulty spark plug #3
Faulty ignition coil #3
Clogged or faulty fuel injector #3
Intake air leak
Insufficient cylinder #3 compression
Incorrect fuel pressure

How to Fix the DTC P0303 2018 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 P0303 code means that cylinder #3 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 #3. 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 P0303 2018 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 P0303 2018 Honda CR-V code?

Need more information on how to fix the P0303 2018 Honda CR-V code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0303 2018 Honda CR-V 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 P0303 2018 Honda CR-V Code

1. What are the common symptoms of OBDII code P0303 (No. 3 Cylinder Misfire Detected) on a 2018 Honda CR-V?

The common symptoms include rough idling, loss of power, engine vibration, and possible increase in fuel consumption.

2. What are the potential causes of OBDII code P0303 on a 2018 Honda CR-V?

Possible causes of code P0303 include faulty spark plug, ignition coil, fuel injector, vacuum leak, or internal engine issues.

3. How can I diagnose the No. 3 Cylinder Misfire Detected code on my 2018 Honda CR-V?

You can diagnose the issue by checking the spark plug, ignition coil, fuel injector, vacuum lines, and performing a compression test on cylinder No. 3.

4. Can a dirty air filter cause OBDII code P0303 on a 2018 Honda CR-V?

While a dirty air filter is not a direct cause of a cylinder misfire, it can impact engine performance and contribute to related issues. It's recommended to ensure the air filter is clean and properly installed.

5. Is it safe to drive my 2018 Honda CR-V with OBDII code P0303?

It is not recommended to drive your vehicle with a cylinder misfire as it can cause further damage to the engine and catalytic converter. It's best to address the issue promptly.

6. How can I repair OBDII code P0303 on my 2018 Honda CR-V?

Repair options include replacing the spark plug, ignition coil, or fuel injector on cylinder No. 3, fixing any vacuum leaks, or addressing internal engine problems if necessary.

7. Can a bad fuel pump cause OBDII code P0303 on a 2018 Honda CR-V?

A faulty fuel pump is not a common cause of a specific cylinder misfire, but it can lead to fuel delivery issues that may contribute to misfires. It's advisable to check and ensure proper fuel pressure.

8. Will resetting the OBDII code P0303 on my 2018 Honda CR-V make the issue go away?

Resetting the code without addressing the underlying problem will not solve the misfire issue. It's important to diagnose and repair the root cause of the cylinder misfire.

9. How much does it cost to fix OBDII code P0303 on a 2018 Honda CR-V?

The cost of fixing code P0303 can vary depending on the specific cause of the misfire and the parts and labor involved. It's recommended to get a diagnosis from a qualified mechanic for an accurate estimate.

10. Can a clogged catalytic converter trigger OBDII code P0303 on a 2018 Honda CR-V?

A clogged catalytic converter can lead to engine misfires, including cylinder-specific ones. It's essential to investigate the root cause of the misfire to determine if the catalytic converter is affected.