In many cases, the P0302 code may indicate a serious engine problem. Modern vehicles sometimes display a variety of fault codes, indicating problems with the functioning of different parts of the vehicle. Similarly, in modern vehicles, the P0302 code also indicates a misfire in the number 2 cylinder of the engine.
Based on the identification of this code, it becomes easy to check and fix the malfunction of parts in the vehicles. In this post, you will learn about the P0302 fault code in detail. Like: What is the P0302 code? Symptoms and causes of the P0302 code, and how much can it cost to fix it?
The P0302 code means a misfire has been detected in cylinder number 2.The P0302 code is an OBD-II diagnostic trouble code related to a misfire in the vehicle’s engine number 2 cylinder, which can be read with the help of an OBD digital scanner tool.
The P0302 code is triggered by the system when there is a misfire in engine cylinder 2. Possible causes of misfire in cylinder 2 of the engine are faulty spark plugs, a bad ignition coil, vacuum leaks, fuel delivery problems, etc.
P0302 Code Definition
P0302 Code Definition Is – ”Cylinder 2 Misfire Detected”
Symptoms of P0302 Code
Engine starting problem
Engine misfire
Engine jerk
Reduction in fuel efficiency
Check engine light
Reduced engine power and performance
Acceleration hesitation
Engine knocking
P0302 code displayed in scanner
Fuel and raw smoke smell from the exhaust pipe.
Engine shutdown frequently
RPM needle up/down
Engine shaking or vibration when turning on the AC
Causes of P0302 Code
Faulty spark plug
Damaged spark plug wire
Faulty ignition coil
Clogged fuel filter
Failed fuel pump
Intake system vacuum leak
Faulty fuel injector
Cylinder compression is low.
Damaged engine head gasket
Faulty EGR Valve System
Clogged catalytic converter
Damaged or worn engine valves or pistons
Faulty Engine Control Module
How To Diagnose And Fix P0302 Code?
To diagnose the P0302 code, the mechanic may repeat the following procedure: such as
Diagnosing the P0302 error code requires first examining its cause.
For this first, you have to scan the system of the vehicle with an OBD scanner, reset the displayed fault code, and freeze data.
After this, the spark plug can be checked. If the spark plug is faulty, replace it with a new one.
Check the spark plug wire; if it has a faulty spark plug wire, it needs to be replaced.
If the ignition coil is faulty, it should also be replaced.
The fuel delivery system should be checked, and fuel system components should be repaired or replaced if defective. such as a clogged fuel filter, a bad fuel pump, and faulty fuel injectors.
The engine control model can also be checked. If any type of fault is detected in the ECM, it is repaired or can be replaced with a new one.
Check for air leaks in the air intake manifold.
Engine compression should be tested. such as an engine head gasket, a piston, a ring, a head valve, etc.
However, this is a process under “engine overhauling,” which can become a matter of high cost.
How To Fix P0302 Code?
Driving the vehicle for an extended period of time ignoring the P0302 code can result in a variety of engine damage. So get it fixed immediately if you see symptoms of code P0302, so that it can be saved from any major, costly damage to the vehicle. For this, the step-by step process can be corrected after checking.
1. Replace Damaged Spark Plugs & Ignition Coils
The power supply is a major factor in keeping the engine running in vehicles. if the spark plugs and ignition coil are damaged in the engine. So replace it with a new one, and also replace the spark plug wire connector. because the supply of current gets interrupted due to the failure of these components.
2. Fix Vacuum Leak
For the combustion process to take place in the engine, it is very important to have the right amount of vacuum. But the vacuum is leaking from somewhere in the vacuum assembly of the DIET engine. So the proportion of air in the fuel mixture prepared for the combustion process may deteriorate. Due to this, the combustion process in the combustion chamber of the engine will be disrupted, which will cause the engine to misfire.
3. Repair or Replace A Damaged ECM
The ECM is a vital component for the smooth running of all vehicle functions. The ECM processes the proper fuel and power supply to the vehicle’s engine with correct timing. But if there is any error or any defect in the ECM/PCM unit of the vehicle. So the ratio of fuel and current supply to the vehicle’s engine and the timing of the fuel firing sequence of the pistons may deteriorate. Due to this, there may be a problem with misfiring in the engine. For this, check the vehicle’s ECM unit and fix it or replace it with a new one.
4. Replace Clogged Fuel Injectors
Fuel injectors are also an important component of a vehicle’s engine. The fuel injector precisely sprays the fuel into the combustion chamber, due to which the internal combustion of the engine takes place. But sometimes the fuel injector starts leaking or clogged. Due to this, the proper amount of fuel is not sprayed, and because of this, the engine may misfire.
5. Correct The Wrong Engine Timing
Proper timing of the engine’s crankshaft and camshaft is set to process the engine’s fuel firing sequence. so that the sequence of fuel firing can be done at the right time according to the position of the piston in the engine. so that the combustion process can be completed according to the position of the piston.
And the exhaust gas can be exhausted according to the position of the piston. But sometimes, due to a broken or loose timing belt or chain, the engine timing can be thrown off, which causes the engine of the vehicle to misfire. Therefore, in the event of an engine misfire, check the engine timing and, if the timing is set incorrectly, set the timing to the correct position.
6. Replace Damaged Crankshaft or Camshaft sensor
The engine is fitted with sensors to signal the rotation positionof the crankshaft and camshaft. These sensors send signals to the ECM for the rotational position of the engine’s crankshaft and camshaft. Due to this, the ECM of the vehicle sends the fuel mixture and current supply with the correct timing according to the requirements of the engine.
But sometimes the proper signal does not reach the ECM due to a faulty sensor or any wire connected to it.Due to which the timing of fuel firing order and current supply gets disturbed, due to which the engine misfires.
7. Fix Intake Manifold Gasket Leak
The fuel mixture for a vehicle’s engine is determined by the air-to-air ratio of the mixture. which is necessary for the internal combustion process of the engine, due to which the fuel mixture becomes flammable. But sometimes a vacuum leak is caused by a failure of the gasket to stop the leak at the air intake. This can disturb the ratio of air to fuel in the fuel mixture, due to which the engine of the vehicle may misfire.
8. Replace Bent Engine Head Valve
Valves in the engine head allow the intake air and exhaust gases to be released at the right time according to the position of the pistons. But sometimes, due to some reason, the valves in the head of the engine become bent, causing leakage of intake air and compression, which can cause misfiring of one of the engine’s cylinders.
Cost Of Fix To P0302 Code
It can usually cost from $150 to $500 to fix the common causes of the upper P0302 error code. This may include the cost of diagnosing the P0302 code and replacing some common minor parts and mechanical labor.
The cost of fixing more expensive causes can range from $1000 to $2900. In which may be engine internal faults or engine overhauling. The cost to fix a P0302 code depends on the model and repair location of the vehicle, the labor of the mechanic.
Ignition Coils: $230-$640
Spark Plug Wire: $180-$240
Cost to fix fuel injector leaks: $50 to $150
Fuel Injector Replacement Cost: $1400–$1800
Vacuum Leakage – $100-$200
Fuel Pump Repair or Rebuild Cost: $1200–$1700
Fuel Pressure Regulator: $300-$500
Engine head valve replacement cost: $900–$1600
FAQ’s
Q. Is a cylinder 2 misfire serious?
Your vehicle’s engine misfiring can be a serious problem for any number of reasons. Because the misfiring of any cylinder of the engine has a very bad effect on the power and performance of the engine of your vehicle, and the internal parts of the engine may get damaged.
Q. How much does it cost to fix cylinder 2 misfire?
The cost of repairing a misfire in cylinder 2 of an engine depends on the fault in the engine. If the internal parts of the engine are damaged. So it can be a matter of high cost. In this case, you may have to go through the process of overhauling the engine. Usually, you may have to pay from $200 to $1500 to fix the misfire in cylinder 2 of the engine.
