Cylinder 7 Injector Circuit Range/Performance
The P02F4 code indicates that the Engine Control Module (ECM) has detected a malfunction in the electrical circuit or performance of the fuel injector for cylinder 7. This could be due to an open or short circuit, high resistance, or a mechanical issue with the injector itself. The ECM monitors the injector's electrical response and fuel delivery; when the actual performance deviates from expected parameters, this code is set.
01. Most Common Causes
- Faulty fuel injector on cylinder 7
- Open or short in injector wiring or connector
- Engine Control Module (ECM) failure
- Corrosion or damage at injector harness
02. Symptoms You Will Notice
- Engine misfire on cylinder 7
- Rough idle or hesitation
- Decreased fuel economy
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect injector wiring and connector for damage or corrosion.
Step 3: Use a multimeter to test injector resistance (typically 11-18 ohms).
Step 4: Perform a injector balance test or flow test to compare cylinder 7 to others.
Step 5: Check for power and ground at injector connector with key on.
Step 6: If wiring and injector are good, suspect ECM issue.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause misfire, catalytic converter damage, and reduced performance. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. Injector replacement is around $100-$200, plus diagnostic time.