Error Code P0307 What It Means & What To Do?

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There are 4-6 cylinders in most of the vehicles. Each and every cylinder would fire a spark plug in a smooth as well as steady manner. Fire is set to the fuel by the spark plug by using a flammable fuel/air mixture. The crankshaft would be then powered by the energy which has been released by the fuel.

The revolutions per minute of the crankshaft are controlled by the cylinders. All the cylinders would work together so that the crankshaft is able to rotate continuously. Now if the cylinder would misfire, then the crankshaft revolutions per minute will keep on increasing as well as decreasing.

If the PCM would detect that there is an increase or decrease of the crankshaft revolutions per minute, then it would start triggering the P0307 fault code.

When a misfire would occur, then the speed of the engine would start fluctuating. Now if the speed of the engine would start fluctuating enough to cause the crankshaft position sensor signal to vary, then the engine control module would start determine that a misfire is occurring.

The definition of P0307 trouble code is Cylinder 7 Misfire Detected.

What causes this problem with the Cylinder 7 Misfire Detected?

• Issue of damaged or worn out spark plug wires
• Flaws in the distributor cap
• Rotor button might be damaged
• Defaults in the fuel injector
• Faults in the spark plug in cylinder 7
• The exhaust gas recirculation valves or tubes might be clogged
• The valves might be burned
• Inaccurate ignition timing
• Issue of vacuum leaks
• There might be no compression in cylinder 7
• Low fuel pressure
• Faulty catalytic converter
• Defaults in the PCM
• Head gasket leaks
• There can be faulty camshaft sensor
• Defaults in the crankshaft sensor
• Flaws in the mass air flow sensor
• Some quirks in the oxygen sensor
• The throttle position sensor might be defective

1. Head Gasket - Did your mechanic just found out that there is some fault in the Head Gasket? Buy top notch Head Gasket from us at economical prices.
2. Powertrain Control Module - A broken Powertrain Control Module can cause a lot of issues. It would be nice if you get it replaced on time.
3. Crankshaft Sensor - Everything is fine with the Powertrain Control Module and still OBD code P0307 flashing? Then there is definitely some fault with the Crankshaft Sensor. Get it checked and replace if needed.
4. Spark Plug - Spark Plug is an important car part which should never be neglected. May be there is some fault in it due to which P0307 code may start flashing.
5. Camshaft Sensor - A faulty Camshaft Sensor can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Fuel Injector - P0307 code does not really end up spoiling your Spark Plug, but it might also accompany few Fuel Injector issues. We have best Fuel Injector with us.
7. Oxygen Sensor - Are you facing OBD Error Code P0307? Don’t worry as you can fix this issue with new Oxygen Sensor. We care for our customers, that’s why we have Oxygen Sensor for every make and model.

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0307. They are mentioned here as follows:

Common Symptoms

• The car might idle roughly
• The check engine light might start flashing
• Car might take a lot of time to start up or it might not start up at all
• The car may die when it is stopped
• Issue of vehicle hesitation while accelerating
• There can be lack of power while driving
• The overall fuel consumption might start increasing
• The vehicle might stall or die at stops

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0307:

• The damaged spark plugs should be replaced
• You can always replace the damaged or worn spark plug wires and coils
• Carefully repair or replace clogged EGR valves or tubes
• The leakage in the vacuum should be repaired
• Fix the leaking head gaskets
• The defected camshaft sensor should be restored
• Reinstate the faulty crankshaft sensor
• If there are some flaws in the mass air flow sensor, then it should be replaced properly
• The faulty oxygen sensor should be replaced or repaired as per the requirement
• Replace the throttle position sensor
• Defective fuel injectors should be restored
• Replacing faulty catalytic converter
• You should diagnose and repair other related trouble codes
• Replace the distributor cap and rotor button, wires, coils, and plugs
• Repair the faulty internal engine components
• The damaged engine should be replaced if there is damage in the cylinder
• Faulty powertrain control module should be replaced as per the need

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Here are some steps which you should follow in order to diagnose this fault code:

• You should use an OBD-II scanner to retrieve freeze frame data and all of the trouble codes that have been stored by the powertrain control module
• The test drive of the vehicle should be completed to see if the P0307 trouble code comes back
• The live data should be reviewed to identify which cylinders are showing misfire data
• Carefully inspect the spark plug wires or coil packs for wiring that is damaged or worn
• Make sure that you check the spark plugs for excessive wear, cracks or breaks
• Examine the coil pack wiring at the harness and connector for breaks as well as corrosion
• Replace the spark plugs, spark plug wires, coil packs, coil pack wiring at harness and connector as per the requirement
• If the P0307 trouble code is still present after the spark plugs, spark plug wires and coil packs have been replaced, then you must inspect the fuel injectors and fuel injector system for faults
• Older vehicles have a distributor cap and rotor button system. For these vehicles, the mechanic will inspect the distributor cap and rotor button for damage, cracks or excessive wear
• If other related trouble codes have been stored by the powertrain control module, the mechanic will need to diagnose and repair these issues as necessary
• You should test drive the vehicle again to see if the P0307 trouble code is triggering up again or not
• If the P0307 trouble code returns, the compression system should be inspected. A fault in the compressor is rare but possible for this code
• If the P0307 trouble code still persists, then the powertrain control module is defective. Then you should replace or reprogram the PCM. This is not common, but should be considered as a possibility when other diagnostic measures have not resolved the misfire condition.

Common Mistakes When Diagnosing The P0307 Code

• The people might make a common mistake of neglecting to rule out all of the possible causes for the misfire condition
• The fuel injector wiring should be visually inspected before replacing spark plugs, spark plug wiring, coil packs, and coil pack wiring.
• In addition to ruling out the faulty cylinder, other related stored trouble codes will need to be diagnosed and repaired.
• Taking time to address the other possible causes of the misfiring condition during the diagnostic process may save a lot of your precious time as well as money