Exhaust Pressure Sensor A Circuit High

Where it lives

For P0473, the circuit described runs through the sensor. The description of P0473 reports a fault at the sensor.

Check these first

• A failed exhaust pressure sensor A reading high
• An open in the sensor A signal wire
• A poor pin fit at the sensor A connector
• A clogged exhaust pressure tube
• A restricted exhaust or diesel particulate filter

What to do next

1. Read the exhaust pressure sensor A voltage on a scan tool
2. Check the sensor A signal wire for an open
3. Inspect the sensor A connector pins
4. Check the pressure tube for blockage
5. Replace sensor A if the voltage stays high
6. Clear the code and retest

Look up another code