What is OBD-II Code P02F4 – Cylinder 7 Injector Circuit Range/Performance

What is OBD-II Code P02F4 – Cylinder 7 Injector Circuit Range/Performance

OBD-II (On-Board Diagnostics, version 2) is a standardized system used in modern cars to detect and report engine-related issues. OBD-II codes are alphanumeric codes that provide diagnostic information about the engine’s system. If your car’s check-engine light is on, it’s likely due to an issue reported by the OBD-II system, such as P02F4 – Cylinder 7 Injector Circuit Range/Performance. In this article, we’ll explain what OBD-II Code P02F4 means and how to repair it.

What is OBD-II Code P02F4?

OBD-II Code P02F4 indicates that there is an issue in Cylinder 7 Injector Circuit of the engine. The Injector Circuit is responsible for delivery of fuel into the engine for combustion. Cylinder 7 Injector Circuit relates to cylinder 7 of the engine. At times, there may not be any noticeable symptoms, but the check-engine light would illuminate.

What Causes OBD-II Code P02F4?

There could be a number of potential causes for OBD-II Code P02F4, including:

1. Faulty Injector: The most common cause of the P02F4 code is a faulty injector. The injector might be clogged or not working properly, leading to improper fuel flow.

2. Faulty wiring: The wiring that connects the fuel injector to the car’s computer might be damaged or corroded, causing the computer to receive incorrect injector values.

3. Failed Fuel Pump: If the fuel pump is not working properly, the required amount of fuel wouldn’t be sent to the specific cylinder, thus leading to the P02F4 error.

4. Failed PCM: The PCM (Powertrain Control Module) or Engine Control Module (ECM) may be defective, resulting in P02F4 code.

5. Low fuel pressure: P02F4 can also be caused by low fuel pressure. If the pressure is too low or fluctuating, it can result in fuel delivery issues.

How to Diagnose the issue?

Diagnosing the cause of OBD-II Code P02F4 can prove to be difficult without the proper tools and knowledge. We recommend taking your car to a professional mechanic to diagnose the issue. They can diagnose the issue with the help of a professional scanner or diagnostic tool, allowing them to identify any potential problems with the injector or the injector circuit.

Alternatively, before visiting a mechanic, you can undertake some basic steps, such as visually inspecting the wiring and checking the connectors.

How to Repair OBD-II Code P02F4?

Once the cause of the issue has been identified, you can then take appropriate measures to repair the problem. Measures could include:

1. Replace the Fuel Injector: If the cause of the problem is a faulty fuel injector, it needs to be replaced. Replace the injector with a new one and ensure that it’s compatible with your car’s make and model.

2. Repair Damaged Wiring: Check for any damage to the wiring and if required, repair or replace the wiring. If the corrosion is present, use a corrosion remover to restore the connector to its original state.

3. Replace the Fuel Pump: If the fuel pump is the problem, the best solution is to replace the pump. Replace it with a high-quality fuel pump and ensure it’s compatible with your car’s make and model.

4. Replacement of PCM: If diagnostic tests reveal that the PCM is faulty, it’s recommended to replace the ECM or PCM. It’s crucial to ensure that the replacement is compatible with your car’s make and model.

5. Check Fuel Pressure: If low fuel pressure is the issue, the fuel pressure regulator or fuel filter must be replaced.

Frequently Asked Questions

1. Can I drive my car with Code P02F4?

We do not recommend driving your car with Code P02F4 as it can cause engine damage. It’s recommended that you take the car to a mechanic for diagnosing the problem and repairing it at the earliest.

2. What is the cost of replacing the fuel injector of the problematic cylinder?

The cost of replacing a fuel injector varies depending on the make and model of the car. On average, you can expect to pay between $150 to $350 for a replacement injector.

3. What is the lifespan of a fuel injector?

The lifespan of a fuel injector can vary depending on the make and model of the car. Most injectors last between 50,000 to 100,000 miles. However, some high-end injectors can last longer.

4. Can a clogged fuel injector be cleaned?

Yes, a clogged fuel injector can be cleaned, and some products are available in the market for injector cleaning. Alternatively, modern-day mechanics use ultrasonic cleaning systems to clean injectors.

5. What are the other ways to detect Engine-Related issues?

Modern-day diagnostics share data via the OBD-II port; however, some warning signs can help detect engine-related issues. Typical symptoms include grinding noise, exhaust odor, difficulty in starting, smoke emitting from the exhaust, oil stains beneath the car, and engine overheating.


OBD-II Code P02F4 is a critical issue that requires prompt diagnosis and repair. It’s recommended to take the vehicle to a certified mechanic for repair to avoid further damage to the engine.

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