![]() ![]() Low Compression– If you have a leaking head gasket, bent valve, cracked head, etc.If the ECU is not getting the right signal from these sensors, the vehicles timing is not going to sync up and it’ll misfire. Cam or Crank Sensors– This one is very unlikely, but it does happen.Popular Mechanics: How to find a vacuum leak. It’s easy (and kind of fun) to chase one down. This will cause the cylinders to misfire and it’ll throw the P0306 if the leak is around that specific cylinder on the intake manifold. Vacuum leak– If your Odyssey has a vacuum leak, it can be very difficult for it to get the right air/fuel mixture.This is definitely not the place to start. 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 gone bad, it won’t be able to properly atomize the fuel and you’ll get the P0306.Coil Packs– Coil packs rarely go bad, but when they do, they can certainly cause P0306 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, but they can still go bad.Here’s a great video on how to see if a spark plug is bad. That being said, the plugs are a great place to start. Most vehicles now come with iridium plugs that need changed very infrequently. Take a look at the electrodes and see if they are in good shape. ![]() Bad Spark Plugs– Spark plugs are one of the most common causes of P0306.They are presented somewhat in order from most to least likely to be causing the code: Here are the most common problems that may cause it. There are quite a few things that can cause the P0306 trouble code to trigger the Honda Odyssey. P0306 Trouble Code Diagnosis- 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 vehicle itself may begin to run rough.The P0306 trouble code will trigger the Odyssey’s service engine soon light.It won’t be the sixth cylinder that you might see when looking at the engine. An important thing to understand when finding the location of Cylinder 6 is that it’s going to be the sixth cylinder in the firing order. P0306 is a cylinder specific misfire code, which means that Cylinder 6 is misfiring and causing it. Mileage may suffer as well when your Odyssey has P0306 as well. The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 6 into the exhaust. 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. These particular codes indicate that there is a misfire in cylinder one, two, three, four, and five respectively.įixing P0306 should be considered a high priority. The nice thing about P0306 is that it’s a cylinder specific trouble code, which makes diagnosing the problems much more simple than P0300, which means that the cylinders are randomly misfiring. P0306 is certainly a cause for concern, and should be considered a threat to the drivability your Odyssey. P0306 is a fairly common trouble code with the Honda Odyssey.
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