2007 Toyota P0304: What It Means & Is It Safe to Drive?
P0304 on the 2007 Toyota: Cylinder 4 Misfire Detected. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainHigh urgency
What this code means
Misfire confirmed on cylinder 4. On 4-cylinder engines, this is the last cylinder—check coil and plug first, then injector, then compression.
Common causes on the 2007 Toyota
- Worn spark plug on cylinder 4
- Failed ignition coil on cylinder 4
- Faulty or clogged fuel injector
- Low compression or valve issue
Symptoms
- Check Engine Light
- Rough idle and shaking
- Poor acceleration or power loss
Typical fixes
- Replace spark plug and COP coil on cylinder 4
- Clean or replace fuel injector
- Compression and leak-down test if basic parts check out
Repair cost range
For a 2007 Toyota, repairs for P0304 typically fall between $150 and $900, depending on the root cause and labor rates in your area.
Known issues on Toyota
P0304 on Toyota four-cylinder engines (2AZ-FE, 1ZZ-FE) typically means a failed COP coil or fouled spark plug on cylinder 4, at the firewall end of the engine. Confirm by swapping the coil to cylinder 1 before purchasing parts.
Most commonly affected models
Camry 2AZ-FE 2002–2011Corolla 1ZZ-FE 2003–2008Highlander 2.4L 2001–2007