Vacuum leak– If your Odyssey has a vacuum leak, it can be difficult for the PCM to get the right air/fuel mixture.You’ll likely see P0171 with a bad injector. Here’s a good video on how to diagnose an injector it can be a little tricky. Bad Fuel Injector– If you have a fuel injector that has failed, it won’t be able to properly atomize fuel, and you’ll get P0301.Coil Packs– Coil packs rarely go bad, but when they do, they can cause P0301 in your Honda Odyssey.Here’s how to tell if your plug wires are bad (video). Spark Plug Wires– On most modern engines, the plug wires are not nearly as long as they once were (if your van even has them), but they can still go bad.Here’s a great video on verifying a spark plug is bad. That being said, a bad spark plug is the number one offender when it comes to P0301. Most vehicles now come with iridium plugs that need to be changed very infrequently. Look at the electrodes and see if they are in good shape. Bad Spark Plugs– A fouled spark plug is the most common cause of P0301.They are presented somewhat in order from most to least likely to be causing the code: The spark plug to the left was bad enough to cause a bad backfire and threw the P0301 trouble code, which indicated cylinder 1 had the misfire. Here are the most common problems that may cause it. There are quite a few things that can cause the P0301 trouble code to trigger the Honda Odyssey. You may smell raw gas coming from the tailpipe. The vehicle may produce excess vibration, especially at lower RPM.It depends on how serious the misfire is. The van itself may begin to run rough.The P0301 trouble code will trigger your Odyssey’s check engine light.Here are the most common symptoms of P0301 in the Honda Odyssey. If one of the above variables is off, your Odyssey’s first 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 the 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: A quick google image search will confirm the correct cylinder (include your Odyssey’s model year). On “V” configuration engines, it’ll usually be the first cylinder on the head closest to the front of the engine. Cylinder one is typically the closest to the front of the engine. P0301 is a cylinder-specific misfire code, meaning it’s only the first cylinder that has a misfire. P0301 Meaning: Cylinder 1- Misfire Detected Cylinder 1 The most common fix for P0301 is to replace the spark plugs, coil packs, or (if equipped) plug wires. 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. P0301 is certainly a cause for concern and should be considered a threat to the drivability of your Odyssey.įixing P0301 should be considered a high priority. It’s an OBD2 code and indicates that your van’s first cylinder is misfiring. P0301 is a fairly common trouble code with the Honda Odyssey.
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