Last reported case: 2 months ago
Based on 4 owner reports, 4 from forums)
What is P0304?
P0304 indicates a misfire specifically in cylinder 4, meaning that cylinder is not firing properly or at all. This is a critical powertrain issue that can cause severe engine damage if driven for long, and it's commonly triggered by ignition, fuel, or compression problems. Based on real owner data, this code is frequently reported in vehicles like the Chevrolet Spark, Honda Accord, and Chevrolet Tahoe.
Common Causes:
- Faulty spark plugs or ignition coils (commonly mentioned in owner discussions for maintenance)
- Head gasket failure (specifically cited in Honda Accord cases causing multiple misfires)
- Fuel delivery issues like clogged injectors (implied as a common misfire cause)
Symptoms:
- Engine runs rough or shakes noticeably (owners describe rough running and vibrations)
- Check Engine Light flashes or is illuminated (implied by diagnostic trouble code triggering)
- Loss of power or engine going into 'limp mode' (reported in Honda Accord cases)
🚗P0304 on 2010 TOYOTA Tacoma
This page focuses specifically on P0304 issues reported by 2010 TOYOTA Tacoma owners. The experiences and fixes below are from real owners of this exact vehicle.
Symptoms Reported by 2010 TOYOTA Tacoma Owners:
Parts Often Involved:
What Owners Say
Real experiences from 2010 TOYOTA Tacoma owners
“If it stays P0304 I will move on to plug connector injector checks. If I end up needing parts I am looking at Denso iridium spark plug 3421 $63 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW SK20HR11 and Denso direct ignition coil 673 1308.”View original
“If I end up needing parts I am looking at Denso iridium spark plug 3421 $63 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW SK20HR11 and Denso direct ignition coil 673 1308.”View original
“It is the factory original wiring as far as I know. (Where does the wire from the coil end up at on the non coil end? My luck behind the motor on the firewall.) Everything appears to be OK since I was all over the top of the motor replacing all the coils.”View original
“My luck behind the motor on the firewall.) Everything appears to be OK since I was all over the top of the motor replacing all the coils. All the spark plugs are new as well.”View original
“I got a pretty cheap 2001 Tacoma with the 3.4l V6 with 232k on it about a month ago. When I got it, it had a rough idle, and three codes on it P0441, P0450, and P1135.”View original
“When I got it, it had a rough idle, and three codes on it P0441, P0450, and P1135. I replaced the front bank O2 sensor, and the Fuel Tank Pressure sensor and cleared the codes and all was good.”View original
“Hi all, 2002 2.7 Auto with approximately 105k miles. Sine ownership around 85k miles I have always used Shell gas as I've been told to use top tier gas.”View original
“Sine ownership around 85k miles I have always used Shell gas as I've been told to use top tier gas. Noticed I had a little rough idle at stop lights while in drive, but when put in park the vehicle would idle fine.”View original
These are real experiences shared by 2010 TOYOTA Tacoma owners on automotive forums and communities. Results may vary based on vehicle condition and repair quality.
About This Data
This page aggregates 4 discussions about P0304 from 2010 TOYOTA Tacoma owners across automotive communities.
Success rate (0%) is calculated from posts where owners confirmed whether their fix resolved the issue.
Last updated: 12/22/2025