Your cost may differ depending on your location and type of vehicle. These prices are based on national averages and include parts and labor. Once properly diagnosed, P0307 may require one or more of the following repairs to resolve the underlying issue. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0307 code. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). It’s impossible to give an accurate estimate without properly diagnosing the issue first. P0307 can be caused by anything from old spark plugs to vacuum leaks to poor engine compression. These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing. If your vehicle is misfiring and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs. With a misfire fault, the first step is to get it diagnosed to figure out what is causing the engine to misfire. In some cases, drivers may experience decreased fuel economy, fuel smell from exhaust, rough idling, or lack of power from the engine.Drivers may not notice any adverse conditions when driving.Engine runs rough, hesitates, or jerks when accelerating.Poor quality fuel that is old or contaminated.Camshaft and/or crankshaft sensor defective.Ignition issues, including failing or damaged ignition coils.Faulty or worn spark plugs and/or spark plug wires.The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it’s been a while since you had a tune-up. Misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. P0307 indicates that cylinder #7 is experiencing misfires. A misfire typically occurs when the timing of this ignition is off. Power is generated by pistons that move up and down while fuel is ignited at very specific times. Most engines have a 4, 6, or 8-cylinder engine, where more cylinders typically mean more power. Your vehicle moves when gasoline is burned and power is generated inside a chamber known as the cylinder. Because there are so many variables that could cause a misfire, the best cost savings is to take your car into a shop to have it diagnosed as quickly and accurately as possible. Diagnosis: A multiple misfire can be caused by anything from faulty spark plugs to low engine compression.Repair Urgency: Fix this code immediately (same-day if possible) to avoid ignition failure, catalytic converter damage, and dangerous conditions.Issue Severity: SEVERE – Stop driving immediately.P0307 definition: Cylinder 7 misfire detected.
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