The P02B4: Cylinder 7 – Injector Restricted code indicates that the fuel injector for cylinder 7 is not delivering the proper amount of fuel due to a restriction. This could be caused by a clogged or faulty fuel injector, contaminated fuel, or low fuel pressure. Addressing this issue is important to restore proper engine performance and fuel efficiency.
P02B4 – Quick Overview
Meaning | P02B4: Cylinder 7 – Injector Restricted |
Is it serious? | Yes, this code can lead to engine misfires, poor performance, and increased fuel consumption if not resolved quickly. |
Possible causes | – Clogged or faulty fuel injector – Contaminated fuel – Low fuel pressure |
How to diagnose? | – Clean or replace the fuel injector for cylinder 7 – Check for fuel contamination – Verify fuel pressure is within specifications |
P02B4 Meaning
The P02B4: Cylinder 7 – Injector Restricted code means that the fuel injector for cylinder 7 is restricted, meaning it is not delivering the correct amount of fuel. This can result from a clogged injector, fuel contamination, or low fuel pressure. If not addressed, this can cause misfires, rough idling, and poor engine performance.
Step-by-step diagnostic guide
Here is a step-by-step guide to troubleshoot and repair the P02B4 code:
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check for any additional related codes that may help provide more information on the fuel system or injector. | OBD-II Scanner |
Inspect the Fuel Injector | Remove and inspect the fuel injector for cylinder 7. Clean the injector if clogged, or replace it if necessary. | Fuel Injector Cleaner, Multimeter |
Check for Fuel Contamination | Inspect the fuel for contamination, such as dirt, water, or debris. Replace the fuel if it is contaminated. | Fuel Testing Kit, Fuel Drain Tools |
Verify Fuel Pressure | Test the fuel pressure to ensure it is within manufacturer’s specifications. Low pressure can restrict injector performance. | Fuel Pressure Gauge |
Inspect the Fuel Pump and Filter | Check the fuel pump and filter for proper operation and ensure there are no blockages or malfunctions. Replace if necessary. | Fuel Pump Tester, Replacement Filter |
Repair/Replace Components | Replace any faulty or contaminated components to ensure proper fuel delivery to cylinder 7. | Replacement Parts, Basic Tools |
Clear Code and Test Drive | After repairs, clear the P02B4 code using an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | Re-scan the vehicle after the test drive to ensure the P02B4 code does not return. | OBD-II Scanner |
By following this step-by-step diagnostic guide, you can effectively troubleshoot and repair the P02B4 code, ensuring the fuel injector for cylinder 7 is functioning correctly and restoring your vehicle’s performance.

Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)