![]() There may be no noticeable symptoms at all. Here are the most common symptoms of P0303 in the Honda Odyssey. If one of the above variables is off, your Odyssey’s third cylinder will misfire, or it won’t fire at all. Compression– The air-fuel mixture must be compressed during the engine’s power stroke.Spark– The spark plug needs to fire at the right time and at the right temperature.Air– It needs to be metered by your Odyssey’s mass air flow sensor or MAP sensor, so the powertrain control module (PCM) knows exactly how much air to let into the combustion chamber.Fuel– In the right quantity (around 14.7 parts air to one part fuel).In order for an engine to burn fuel efficiently, each cylinder needs the following: Most parts stores will print you a copy of your engine’s cylinder numbers and their location on a sheet of register paper. On inline engines, the third cylinder will usually be the three in from the engine accessories.Ī quick google image search will confirm the correct cylinder (include your Odyssey’s model year and engine type). On “V” configuration engines, it’ll usually be the second cylinder on the head closer to the front of the engine. Before you can diagnose P0303 in your van, 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 Odyssey’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 Odyssey’s check engine light to flash, avoid driving your van 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 van’s third cylinder is misfiring. If your Honda Odyssey has the P0303 trouble code, you should know that it’s about as common of a code as there is.
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