P0301 Honda Code - No. 1 Cylinder Misfire Detected
Quick Answer
The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #1, Faulty ignition coil #1. 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
- P0301 Honda indicates No. 1 Cylinder Misfire Detected.
- Common causes
- Common causes include Valve adjustment, Faulty spark plug #1, Faulty ignition coil #1.
- 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.
Code P0301 Honda Description
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.
What are the Possible Causes of the DTC P0301 Honda?
- Valve adjustment
- Faulty spark plug #1
- Faulty ignition coil #1
- Clogged or faulty fuel injector #1
- Intake air leak
- Insufficient cylinder #1 compression
- Incorrect fuel pressure
How to Fix the DTC P0301 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0301 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.
Need more information about the P0301 Honda code?
Need more information on how to fix the P0301 Honda code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0301 Honda code diagnosed by a professional: Find a repair shop in your area
Information for Specific Honda Models
- P0301 2008 Honda Accord — Cylinder Number 1 Misfire Detected
- P0301 2009 Honda Accord — Cylinder Number 1 Misfire Detected
- P0301 2010 Honda Accord — Cylinder Number 1 Misfire Detected
- P0301 1996 Honda Civic — Cylinder Number 1 Misfire Detected
- P0301 1997 Honda Civic — Cylinder Number 1 Misfire Detected
- P0301 1998 Honda Civic — Cylinder Number 1 Misfire Detected
- P0301 1999 Honda Civic — Cylinder Number 1 Misfire Detected
- P0301 2000 Honda Civic — Cylinder Number 1 Misfire Detected
- P0301 2016 Honda CR-V — No. 1 Cylinder Misfire Detected
- P0301 2017 Honda CR-V — No. 1 Cylinder Misfire Detected
- P0301 2018 Honda CR-V — No. 1 Cylinder Misfire Detected
- P0301 2019 Honda CR-V — No. 1 Cylinder Misfire Detected
- P0301 2020 Honda CR-V — No. 1 Cylinder Misfire Detected
- P0301 2021 Honda CR-V — No. 1 Cylinder Misfire Detected
Frequently Asked Questions about P0301 Honda Code
1. What are the common symptoms of OBDII code P0301 in a Honda?
Symptoms may include engine misfires, rough idling, lack of power, increased fuel consumption, and potentially, an illuminated check engine light.
2. What are some possible causes of a No. 1 Cylinder Misfire Detected in a Honda?
Common causes can include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression in the No. 1 cylinder, or issues with the engine control module.
3. How can I diagnose the source of the misfire in the No. 1 cylinder of my Honda?
Diagnostic steps may involve conducting a visual inspection of spark plugs and ignition components, performing a compression test, checking for vacuum leaks, and using a scan tool to monitor live engine data.
4. Can driving with a P0301 code in my Honda cause further damage?
Continuing to drive with a misfire may lead to damage to the catalytic converter, increased emissions, reduced fuel efficiency, and potential harm to other engine components over time.
5. How can I repair a No. 1 Cylinder Misfire in my Honda?
Repair options may include replacing spark plugs, ignition coils, or fuel injectors, addressing vacuum leaks, conducting a compression test, and clearing the code to see if the issue recurs.
6. Is it safe to continue driving my Honda with a P0301 code?
It is not recommended to drive with a misfire as it can lead to further damage. It's best to address the underlying issue promptly to prevent potential complications.
7. Can bad gasoline cause a No. 1 Cylinder Misfire in a Honda?
Poor-quality gasoline or fuel contaminated with water or debris could potentially lead to misfires, but it's more common for issues with ignition components or engine problems to be the root cause.
8. How much should I expect to pay for repairs related to OBDII code P0301 in a Honda?
The cost of repairs can vary depending on the specific cause of the misfire, but it's advisable to budget for potential expenses related to spark plug or ignition coil replacement, diagnostic testing, and labor costs.
9. Will disconnecting the battery reset the P0301 code in my Honda?
Disconnecting the battery may clear the code temporarily, but if the underlying issue causing the misfire is not addressed, the code is likely to reappear once the vehicle is driven and the problem is detected again.
10. Can a DIY enthusiast fix a No. 1 Cylinder Misfire in a Honda?
While some basic troubleshooting and repairs like replacing spark plugs can be done by DIY enthusiasts, diagnosing complex issues or conducting a compression test may require professional tools and expertise.
Discuss the causes and fixes for P0301 Honda OBDII Code
-
my mechanic change my polly my belts and my power steering pump sparks plugs but I notice my car is flottering and when I turn the steering wheel its making a sound my engine light is also on
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
