OBD-II Generic Error Code P0308: How to Fix It

Q: Can I drive with a P0308 code?

It is not recommended. A misfire can cause the check engine light to flash, indicating catalyst damage risk. Driving short distances at low speed may be possible, but have it diagnosed promptly.

Q: What causes a cylinder 8 misfire?

Common causes include a faulty spark plug, ignition coil, fuel injector, vacuum leak, low compression, or wiring issues. Less common: engine mechanical problems.

Q: How much does it cost to fix P0308?

Cost varies widely. A spark plug replacement may cost $50-150, ignition coil $100-300, fuel injector $200-500. If internal engine repairs are needed, it can exceed $1,000.

Q: Will P0308 clear itself?

If the misfire is intermittent and stops, the code may clear after several drive cycles. However, the underlying issue will likely return. Always diagnose and fix the root cause.

Q: Can a bad catalytic converter cause P0308?

No, a bad catalytic converter does not cause a misfire. However, a misfire left unfixed can damage the catalytic converter, leading to additional codes like P0420.

Abstract

Error code P0308 means that the engine's computer has detected a misfire in cylinder 8. A misfire occurs when the fuel-air mixture in that cylinder fails to ignite properly, causing a loss of power, rough idling, and increased emissions. This is a serious issue that can damage the catalytic converter if ignored, so prompt diagnosis is important.