MaxxForce engines are known for EGR issues—clogging, valve failures, and constant fault codes. If you're getting SPN 2791, SPN 132, or engine derate warnings, it’s likely related to your EGR system.

Here’s how to diagnose and pinpoint EGR problems on a MaxxForce using a diesel laptop.

🛠 What You’ll Need:

• Our Diesel laptop

🔄 Step-by-Step: Check for EGR Issues

1. Connect your adapter to the diagnostic port and open NED

2. Select your engine (MaxxForce 7, 9, 10, DT, etc.)

3. Go to Live Data > EGR Valve Position and Flow Rate

4. Watch for:

   • EGR valve stuck open or closed

   • Flow rate not responding to commands

   • Fault codes like SPN 132 FMI 7 or SPN 2791

5. Run EGR valve actuator test under the “Tests” menu

6. If valve fails to move or gives delayed response, it may need cleaning or replacement

7. Check for excessive soot buildup in EGR cooler and piping

⚠️ Common Symptoms of EGR Failure:

• Low power / derate mode

• Excessive black smoke

• Coolant loss (from leaking EGR cooler)

• Hard start / rough idle

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