OBD-II Generic Error Code P0307: How to Fix It

Q: Can I drive my car with a P0307 code?

It's not recommended. Driving with a misfire can damage the catalytic converter, leading to expensive repairs. If the engine is running poorly, have it towed to a repair shop.

Q: What causes a cylinder 7 misfire?

Common causes include a faulty spark plug, ignition coil, fuel injector, vacuum leak, low compression, or wiring issues. Less common causes include a faulty ECM or clogged catalytic converter.

Q: How much does it cost to fix P0307?

Costs vary depending on the cause. Replacing spark plugs and coils can cost $100-$400. Fuel injector replacement may be $200-$600. Internal engine repairs can exceed $1,000.

Q: Will clearing the code fix P0307?

Clearing the code with an OBD2 scanner will only erase the symptom, not the cause. If the underlying problem is not fixed, the code will return.

Q: Is P0307 the same as P0300?

No. P0307 is a specific misfire on cylinder 7. P0300 is a random misfire code indicating multiple cylinders are misfiring.

Abstract

The P0307 error code indicates that the engine control module (ECM) has detected a misfire in cylinder 7. This can cause rough idling, loss of power, reduced fuel economy, and increased emissions. Continuing to drive with a misfire can damage the catalytic converter, so prompt diagnosis is important.