P0304 2007 Toyota Highlander Code - Cylinder 4 Misfire Detected
Quick Answer
When a misfire occurs, engine speed will fluctuate. Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #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 2007 Toyota Highlander indicates Cylinder 4 Misfire Detected.
- Common causes
- Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #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.
Code P0304 2007 Toyota Highlander Description
What are the Possible Causes of the DTC P0304 2007 Toyota Highlander?
- Faulty Spark Plug #4
- Clogged or faulty Fuel Injector #4
- Faulty Ignition Coil #4
- Fuel Injector #4 harness is open or shorted
- Fuel Injector #4 circuit poor electrical connection
- Ignition Coil #4 harness is open or shorted
- Ignition Coil #4 circuit poor electrical connection
- Insufficient cylinder 4 compression
- Incorrect fuel pressure
- Intake air leak
How to Fix the DTC P0304 2007 Toyota Highlander?
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 P0304 2007 Toyota Highlander 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 2007 Toyota Highlander code?
Need more information on how to fix the P0304 2007 Toyota Highlander code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0304 2007 Toyota Highlander code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0304 2007 Toyota Highlander Code
1. What are the common symptoms of OBDII code P0304 (Cylinder 4 Misfire Detected) in a 2007 Toyota Highlander?
- Common symptoms include rough idle, loss of power, engine vibration, and potential stalling.
2. What are the typical causes of a cylinder 4 misfire in a 2007 Toyota Highlander?
- Possible causes include faulty spark plugs, a failing ignition coil, clogged fuel injector, vacuum leaks, or low compression in the cylinder.
3. How can I diagnose the specific cause of a cylinder 4 misfire in my 2007 Toyota Highlander?
- Diagnose by checking spark plugs, ignition coils, fuel injectors, vacuum lines, and performing a compression test on cylinder 4.
4. Are there any DIY repair tips for addressing a cylinder 4 misfire in a 2007 Toyota Highlander?
- DIY repair tips include replacing spark plugs, swapping ignition coils, cleaning or replacing fuel injectors, and checking for vacuum leaks.
5. Can driving with a cylinder 4 misfire OBDII code in a 2007 Toyota Highlander cause further damage?
- Yes, driving with a misfire can potentially damage the catalytic converter and other engine components over time.
6. How much can I expect to pay to repair a cylinder 4 misfire in a 2007 Toyota Highlander?
- Repair costs can vary but generally range from $100 to $500 depending on the specific cause and parts needed.
7. Will resetting the OBDII code P0304 on a 2007 Toyota Highlander make the issue go away permanently?
- Resetting the code will clear the Check Engine Light temporarily, but if the underlying issue is not addressed, the code is likely to return.
8. Is it safe to continue driving a 2007 Toyota Highlander with a cylinder 4 misfire?
- It is not recommended to drive with a misfire as it can lead to reduced fuel efficiency, potential engine damage, and safety hazards.
9. Can bad fuel quality or contaminated fuel cause a cylinder 4 misfire in a 2007 Toyota Highlander?
- Yes, poor fuel quality or contaminated fuel can contribute to misfires, so it's important to use high-quality fuel from reputable stations.
10. How often should I check and replace spark plugs in a 2007 Toyota Highlander to prevent cylinder misfires?
- It is recommended to check and replace spark plugs every 30,000 to 50,000 miles to maintain optimal engine performance and prevent misfires.
Discuss the causes and fixes for P0304 2007 Toyota Highlander OBDII Code
Code P0304 2007 Toyota Highlander comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
