AutoCodes – Honda – P0302 Honda

P0302 Honda Code - No. 2 Cylinder Misfire Detected

Quick Answer

The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #2, Faulty ignition coil #2. 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: P0302 Honda indicates No. 2 Cylinder Misfire Detected.
Common causes: Common causes include Valve adjustment, Faulty spark plug #2, Faulty ignition coil #2.
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 103,225

How popular is this code, among other codes? Medium

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 P0302 Honda 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 P0302 Honda - No. 2 Cylinder Misfire Detected - AutoCodes.com — P0302 Honda Code - No. 2 Cylinder Misfire Detected

What does this mean?

What are the Possible Causes of the DTC P0302 Honda?

Valve adjustment
Faulty spark plug #2
Faulty ignition coil #2
Clogged or faulty fuel injector #2
Intake air leak
Insufficient cylinder #2 compression
Incorrect fuel pressure

How to Fix the DTC P0302 Honda?

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 P0302 code means that cylinder #2 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 #2. If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes".

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0302 Honda 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.

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Information for Specific Honda Models

P0302 2008 Honda Accord — Cylinder Number 2 Misfire Detected
P0302 2009 Honda Accord — Cylinder Number 2 Misfire Detected
P0302 2010 Honda Accord — Cylinder Number 2 Misfire Detected
P0302 1996 Honda Civic — Cylinder Number 2 Misfire Detected
P0302 1997 Honda Civic — Cylinder Number 2 Misfire Detected
P0302 1998 Honda Civic — Cylinder Number 2 Misfire Detected
P0302 1999 Honda Civic — Cylinder Number 2 Misfire Detected
P0302 2000 Honda Civic — Cylinder Number 2 Misfire Detected
P0302 2016 Honda CR-V — No. 2 Cylinder Misfire Detected
P0302 2017 Honda CR-V — No. 2 Cylinder Misfire Detected
P0302 2018 Honda CR-V — No. 2 Cylinder Misfire Detected
P0302 2019 Honda CR-V — No. 2 Cylinder Misfire Detected
P0302 2020 Honda CR-V — No. 2 Cylinder Misfire Detected
P0302 2021 Honda CR-V — No. 2 Cylinder Misfire Detected

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 P0302 Honda Code

1. What are the common symptoms of OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected?

- Common symptoms include rough idling, loss of power, engine vibration, and potentially an illuminated check engine light.

2. What are the typical causes of OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected?

- Possible causes include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or issues with the engine control module.

3. How can I diagnose the source of the misfire causing OBDII code P0302 in my Honda?

- Diagnostic steps may involve inspecting spark plugs, checking ignition coils, testing fuel injectors, performing a compression test, and scanning for other related trouble codes.

4. Can driving with OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected, cause further damage?

- Continuing to drive with a misfire can potentially lead to damage to the catalytic converter, so it's best to address the issue promptly to avoid costly repairs.

5. Are there any quick fixes or temporary solutions for OBDII code P0302 in a Honda until I can get it repaired?

- While temporary fixes are not recommended, you may try swapping ignition components between cylinders to see if the misfire moves to a different cylinder, helping pinpoint the faulty part.

6. How much does it typically cost to repair OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected?

- The cost of repairs can vary widely depending on the root cause of the misfire, but it may involve expenses for parts and labor ranging from $100 to $500 or more.

7. Can a DIY enthusiast address OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected, without professional help?

- Depending on your mechanical skills and tools available, you may be able to tackle the issue yourself by following online guides or service manuals specific to your Honda model.

8. How urgent is it to address OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected?

- While you may still be able to drive the vehicle with this code present, it's advisable to address the misfire promptly to prevent potential damage to other engine components.

9. Are there any preventive measures to avoid encountering OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected, in the future?

- Regular maintenance, such as timely spark plug replacements, fuel system cleaning, and periodic engine tune-ups, can help prevent misfires and related issues.

10. How long does it typically take to repair OBDII code P0302 in a Honda, indicating a No. 2 Cylinder Misfire Detected?

- The repair time can vary based on the specific cause of the misfire, but a skilled mechanic can usually diagnose and fix the issue within a few hours to a day.