Injector 1 Leakage
Increased leakage detected in fuel injector 1.
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What it means (plain English)
The computer is seeing that fuel is leaking from injector 1, which can cause engine misfire and poor performance. You're basically dumping fuel where it shouldn’t be.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the expected fuel injection timing and quantity for injector 1, comparing it to actual performance. It raises this code when it sees a significant difference, usually based on abnormal fuel flow patterns or pressure.
What a healthy reading looks like
Injector 1 should deliver fuel according to the programmed parameters (rate approximately 140-160 mm³/stroke at idle).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check fuel injector 1 visually for leaks around the injector body and seals. Decision: If leaks are found, replace the injector. If no leaks are visible, proceed to step 2.
- 22. Inspect the wiring and connectors to injector 1 for corrosion or damage. Decision: Repair any wiring issues found or replace connectors before moving to step 3.
- 33. Measure the fuel injection quantity with a scan tool during a test. Decision: If the injected quantity is outside the specified expected values, consider testing or replacing the fuel injector. If quantity is acceptable, proceed to step 4.
- 44. Check the fuel pressure at the rail. It should be within 30-60 PSI while running. Decision: If pressure is low, inspect the fuel pump and replace if necessary. If pressure is fine, test the engine for other possible issues.
Common causes
- Worn or damaged fuel injector seals
- Injector body damage
- Contaminants in fuel causing blockage
- Faulty fuel rail pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, driving with a leaking injector can cause engine damage and poor performance. It should be addressed immediately.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved, the code will likely return once the ECM detects the same problem.
Why do I see this code with other injector codes?
Leakage issues often correlate with misfires or other injector performance codes since they all are related to fuel delivery discrepancies.
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