Exhaust Pressure Sensor A Circuit Intermittent/Erratic

Where it lives

For P0474, the sensor sits on the circuit this code reports. The description of P0474 reports a fault at the sensor.

Check these first

• An intermittent exhaust pressure sensor A
• A loose sensor A connector
• A chafed sensor A wire
• Moisture in the sensor A connector
• A pressure tube that partly blocks and clears

What to do next

1. Wiggle test the sensor A harness while watching the signal
2. Inspect the sensor A connector for moisture
3. Check the sensor A wire for chafing
4. Check the pressure tube for debris
5. Replace sensor A if the dropouts continue
6. Clear the code and retest

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