Reductant Injection Air Pressure Sensor B Circuit Range/Performance

Where it lives

For P209B, start at the sensor the description names.

Check these first

• A reductant injection air pressure sensor B reading outside its range
• A restriction in the reductant injection air supply
• High resistance in the sensor B circuit
• A failed sensor B element

What to do next

1. Read reductant injection air pressure sensor B on a scan tool
2. Compare the sensor B reading to the air supply pressure
3. Check the reductant injection air supply for a restriction
4. Test the sensor B circuit for added resistance
5. Replace the reductant injection air pressure sensor B if the supply tests good
6. Clear the code and retest

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