EGR Temperature Sensor A Circuit Range/Performance

Where it lives

For P040B, start at the sensor the description names.

Check these first

• A failed EGR temperature sensor A
• An erratic signal from sensor A
• Corrosion at the sensor A connector
• A restricted EGR passage that skews temperature
• A cooling system problem lowering EGR temperature

What to do next

1. Compare sensor A temperature to a cold start reading
2. Inspect the sensor A connector for corrosion
3. Check the EGR passages for a restriction
4. Verify coolant level and thermostat operation
5. Replace sensor A if the reading is implausible
6. Clear the code and retest

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