FMI 7 - EGR Flow Rate - Abnormal
EGR (Exhaust Gas Recirculation) flow is not as expected.
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What it means (plain English)
The engine’s computer expects a certain amount of exhaust gas to recirculate back into the intake for cleaner combustion, but it’s getting too little or too much, which can lead to poor performance and emissions issues.
What the computer is actually seeing
The Engine Control Module (ECM) monitors the EGR system's flow rate. It looks for a specific flow percentage, usually expected to be between 40% to 55% during normal operation under load.
What a healthy reading looks like
EGR flow should be within 40% to 55% during testing; voltages from EGR flow sensor should show between 0.5V to 4.5V depending on position.
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 for vacuum leaks in the EGR system; inspect all hoses and connections. Decision: If leaks are found, repair and retest. If no leaks, proceed to step 2.
- 22. Inspect the EGR valve for carbon buildup or blockage. Decision: Clean or replace the EGR valve as necessary; retest. If EGR is clear, move to step 3.
- 33. Test the EGR flow sensor with a multimeter. Expected voltage at idle should be within 0.5V to 4.5V. Decision: If voltage is out of range, replace the sensor. If within range, check wiring and connectors for shorts or corrosion.
- 44. Monitor the EGR operation during a road test; watch for abnormal readings. Decision: If readings remain abnormal, further diagnose the engine’s control modules and examine the exhaust pressure sensor.
Common causes
- Clogged EGR valve or passages
- Faulty EGR flow sensor
- Vacuum leaks in EGR system
- Malfunctioning exhaust pressure sensor
- Wiring issues or bad connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s not recommended to drive for long with this code; performance and emissions can be affected.
Will this code come back if I clear it?
Yes, if the underlying issue isn’t fixed, the code will return.
Why does this code pair with low power issues?
Since EGR affects combustion efficiency, if it fails, it can lead to reduced engine power and increased emissions.
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