P0307 means cylinder 7 misfire detected. Cylinder 7 isn't firing properly (V8 engines). Standard single-cylinder misfire diagnosis: plug, coil, injector.
Drive gently and get it diagnosed within days.
Cylinder 7 isn't firing properly (V8 engines). Standard single-cylinder misfire diagnosis: plug, coil, injector.
Start here.
Swap-test to confirm.
Cylinder 7 fuel delivery.
Valve/ring wear.
Localized lean condition.
Typically $100–$500
Single plug/coil typically $100–$300; injector work typically $150–$400. Estimates vary by vehicle. Costs are estimates and vary by vehicle, location, and shop.
Short drives fine; don't postpone — converter damage risk.
Typically $100–$500. Single plug/coil typically $100–$300; injector work typically $150–$400. Estimates vary by vehicle.
Drive gently and get it diagnosed within days.
The most common cause is worn spark plug in cylinder 7. Start here.