P02A4 Fault Code

P02A4 OBD-II Trouble Code Short Description

Cylinder 3 Injector Restricted

What does trouble code P02A4 mean?

The P02A4 fault code indicates a cylinder 3 injector restriction in the fuel injection system of a car. This means that there is a problem with the fuel injector in the third cylinder, leading to restricted or insufficient fuel flow into that cylinder.

The restricted fuel injector can be caused by various reasons, such as clogging or blockage due to dirt, debris, or carbon buildup. It can also be a result of a faulty injector or a problem in the fuel supply system.

To resolve this issue, the following steps can be taken:

  1. Inspect the fuel injector: Check the injector for any obvious signs of damage or leakage. Clean the injector to remove any dirt or debris that may be causing the restriction.

  2. Check the fuel system: A restricted fuel injector can also be caused by a problem in the fuel supply system. Ensure that there are no issues with the fuel pump, fuel filter, or fuel pressure regulator.

  3. Test the injector: Perform an injector flow test to check if the fuel injector is functioning properly. This test will determine if the injector is delivering the correct amount of fuel to the cylinder.

  4. Replace the injector if necessary: If the injector is found to be faulty or cannot be cleaned effectively, it may need to be replaced. A new injector should solve the restriction issue.

  5. Clear the fault code: After resolving the problem, the fault code should be cleared from the car's onboard computer system using a diagnostic tool. This will ensure that the check engine light does not illuminate unnecessarily.

It is important to address a cylinder 3 injector restriction promptly as it can lead to decreased engine performance, misfires, and potentially engine damage if left unattended. Seeking professional assistance or consulting a qualified mechanic is recommended for a proper diagnosis and repair of this issue.


What are the symptoms of the P02A4 code?

Symptoms of a P02A4 fault code in cars may include:

  • Rough idling or stalling when the engine is at idle
  • Decreased engine performance or power
  • Difficulties when accelerating or maintaining a steady speed
  • Misfires or hesitation during acceleration
  • Increased fuel consumption
  • Illumination of the Check Engine Light (CEL)
  • Reduced engine efficiency and emissions.


What causes the P02A4 code?

The P02A4 fault code in cars indicates a problem with the cylinder 3 injector being restricted. This means that fuel flow to cylinder 3 is insufficient or blocked. Some possible causes of this fault code include:

  1. Clogged or dirty fuel injector: Over time, fuel injectors can become dirty or clogged, resulting in reduced fuel flow to the cylinder.

  2. Faulty injector: The injector itself may be faulty, either due to a mechanical issue or an electrical problem.

  3. Fuel pressure issues: If there is a problem with the fuel delivery system, such as low fuel pressure or a clogged fuel filter, it can affect the injector's performance.

  4. Wiring or connector problems: Issues with the wiring or connectors that connect the injector to the engine control unit (ECU) can cause the injector to not function properly.

  5. ECU or engine management system issues: Faulty programming or malfunctions in the ECU or engine management system can result in incorrect signals being sent to the injector.

It is recommended to have a qualified mechanic diagnose and repair the issue to ensure it is fixed properly.

Possible Solutions

How to fix P02A4?

To fix the P02A4 fault code on cars, you need to address the issue of a restricted injector in cylinder 3. Here are the steps you can take to resolve the problem:

  1. Inspect the Injector: Start by visually inspecting the injector in cylinder 3 for any signs of damage or blockage. Look for clogs, leaks, or any other issues that may be restricting fuel flow.

  2. Clean the Injector: If there are no visible signs of damage, you can try cleaning the injector. Use a fuel injector cleaning kit or a specialized injector cleaner solution to remove any deposits or build-up that may be obstructing fuel flow.

  3. Test Fuel Pressure: Check the fuel pressure in the system to ensure it is within the manufacturer's specified range. Low fuel pressure can cause injector restrictions. If the fuel pressure is low, check the fuel pump, fuel filter, and fuel pressure regulator for any faults or obstructions.

  4. Check Wiring and Connections: Inspect the wiring and connections associated with the injector in cylinder 3. Look for any loose connections, frayed wires, or corroded terminals. Repair or replace any faulty components as necessary.

  5. Replace the Injector: If cleaning and inspecting the injector does not resolve the issue, you may need to replace the injector in cylinder 3. Consult the vehicle's service manual or seek professional assistance for the correct replacement procedure.

  6. Clear Fault Code: After completing the necessary repairs, use a compatible OBD-II scanner to clear the fault code from the vehicle's computer system. This will reset the Check Engine Light.

If you are unsure or uncomfortable performing these steps yourself, it is recommended to consult a qualified mechanic or technician for assistance. They will have the expertise and diagnostic equipment to accurately diagnose and fix the issue.