Before you can diagnose P0303 in your car, you need to find the third cylinder. P0303 is a cylinder-specific misfire code, meaning it’s only the third cylinder that has a misfire. P0303 Definition: 3’rd Cylinder- Misfire Detected 3’rd Cylinder The most common repair for P0303 is changing the spark plugs. It also can cost money to ignore it, since driving with a misfire can damage the Fiesta’s catalytic converter. Unlike a lot of the OBDII codes, this code has to do directly with engine combustion. Repairing P0303 should be considered a high priority. If it’s bad enough to cause your Fiesta’s check engine light to flash, avoid driving your car altogether until you find the misfire and repair your engine. P0303 is a real drivability concern and should be dealt with right away. It’s a generic code (same meaning for all vehicles) that indicates that your car’s third cylinder is misfiring. If your Ford Fiesta has the P0303 trouble code, you should know that it’s about as common of a code as there is.
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