What does code P0304 mean on a Nissan and is it safe to drive?
P0304: Cylinder 4 Misfire Detected. Here's what it means on your Nissan, what usually causes it, what repairs typically cost, and how safe it is 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 for your Nissan
- 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 Nissan, repairs for P0304 often fall between $150 and $900, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Nissan
Nissan QR25DE P0304 on cylinder 4 can come from a coil failure or from CVTC timing issues. Check for any intake or exhaust cam phaser codes stored alongside P0304—they may indicate an oil flow issue rather than a simple ignition fault.
Most commonly affected models
Altima QR25DE 2007–2012Rogue MR20 2008–2013Sentra QR25 2007–2012