![]() Keep in mind this is an intermediate-level diagnosis and repair and not recommended for beginners. If you’d like to try to fix this fault code at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Ignition Coils: $230-$640 (some cars require Intake manifold removal)Įngine code P0303 could be caused by a number of things, including faulty spark plugs, faulty ignition system, distributor failure, and more.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, P0303 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 P0303 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. ![]() P0303 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. You can even use FIXD to clear the fault codes on your vehicle and see if your fix worked, or simply turn off codes that aren’t serious. The FIXD Sensor and app can help you diagnose and fix P0303 yourself by giving you access to detailed engine diagnostics that are easy to understand (even if you don’t know cars), live OBD2 data, and a Mechanic Hotline. With a misfire fault, the first step is to get it diagnosed to figure out what is causing the engine to misfire. 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. Code P0303 CausesĬylinder 3 misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. P0303 indicates that cylinder number 3 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. See how to diagnose and fix P0303 yourself and save hundreds! ![]()
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