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What to check next if you have replaced the DFE sensor on egr system?

1. Check the EGR valve. If the EGR valve is stuck open or closed, it can cause the DFE sensor to malfunction.

2. Check the vacuum lines. If the vacuum lines are cracked or disconnected, it can cause the DFE sensor to malfunction.

3. Check the electrical connections. If the electrical connections to the DFE sensor are loose or corroded, it can cause the sensor to malfunction.

4. Check the ECM/PCM. If the ECM/PCM is not functioning properly, it can cause the DFE sensor to malfunction.

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