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P0300 Diagnostic Code - Random Misfire Technical Description Random/Multiple Cylinder Misfire Detected What does that mean? Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Symptoms Symptoms may include: the engine may be harder to start the engine may stumble / stumble, and/or hesitate other symptoms may also be present Causes A code P0300 may mean that one or more of the following has happened: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked/leaking EGR valve / passages Faulty camshaft position sensor Defective computer Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors. Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open. It is helpful to have access to a factory service manual and an advanced scan tool to properly diagnose a random misfire DTC. P0300 Diagnostics Video Here is a helpful video that may assist you in learning more, diagnosing, and repairing your P0300 DTC. This video is intended for auto repair professionals but could be helpful to DIYers. It shows use of an advanced OBD-II scan tool during diagnostic steps:
P0300 is random misfire code P0301 would be cyl # 1 etc.
With the odb2 scanner at erase codes turn the engine off. With the key in the run position erase the codes. Run the diagnostics again. If you still have P0300 code Check the plug wires. Loss of compression will cause misfire but it would not be random.
Im assuming your asking about the ODB-II codes, this code,P0300 Random/Multiple Cylinder Misfire Detected. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Here are a few things that could be the cause.
Diagnostic Test Code (DTC) P0300 has a generic description of "Random Cylinder Misfire". To put it simply, there is more than one cylinder in your engine that has been misfiring. What needs to be done is to (A) determine WHICH cylinders are actually misfiring. This can be done by using a scan tool to view the misfire data and the freeze frame data that is stored in the computer and (B) Perform proper diagnostic procedures to determine the actual CAUSE of the misfire(s).
Misfires can be caused by many things. It could be as simple and painless as worn-out spark plugs that need to be replaced or it could be much more involved and expensive to repair like burned valves or a blown head gasket.
Misfire issues can generally be categorized as localized or random.A localized misfire in my definition would occur on at most two specific cylinders. In OBD II diagnostic code terms, that would be 2 trouble codes of the form P030x and P030y.; whereas a code P0300 or several different codes P030a, b, c, etc. would indicate a random misfire issue.These two different categories of misfire call for different troubleshooting procedures.In each case, however, the cause of the misfire can be electrical or air/fuel related and can also be continuous or intermittent.I will start with the localized case, so if you have a random misfire, please skip ahead to that section of the post.Click this link for misfiring troubleshooting:---http://schematicsdiagram.blogspot.com/2011/06/how-to-troubleshoot-engine-misfires.html--------------Click this link below for car troubleshooting problems:--- http://schematicsdiagram.blogspot.com/2011/06/car-troubleshooting-guide.html