What does code P0303 mean on a Acura and is it safe to drive?
P0303: Cylinder 3 Misfire Detected. Here's what it means on your Acura, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM has detected a misfire specifically on cylinder 3. Diagnosis follows the same steps as P0301—swap parts to the same position on a known-good cylinder to isolate the fault.
Common causes for your Acura
- Worn or fouled spark plug on cylinder 3
- Failing ignition coil on cylinder 3
- Leaking or clogged fuel injector
- Low compression on cylinder 3
Symptoms
- Check Engine Light, often flashing under load
- Rough idle or shaking
- Loss of power, hesitation
Typical fixes
- Replace spark plug and coil on cylinder 3
- Test and replace fuel injector
- Compression test if ignition parts don't resolve it
Repair cost range
For a Acura, repairs for P0303 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 Acura
Acura J35/J37 V6 P0303 on the rear-bank cylinder 3 requires intake manifold removal for coil access. This is the most common cylinder for reported J-series misfires. Confirm with a coil swap to the front bank before committing to the intake removal.
Most commonly affected models