The P0473: Exhaust Pressure Sensor ‘A’ Circuit High refers to a problem where the exhaust pressure sensor is sending a voltage signal that is too high. This sensor monitors the exhaust pressure, and a high voltage signal could indicate a malfunctioning sensor, excessive voltage supply, or wiring issues. This fault may cause engine performance problems and increased emissions.
P0473 – Quick Overview
| Meaning | P0473: Exhaust Pressure Sensor ‘A’ Circuit High |
| Is it serious? | Yes, this code can cause incorrect exhaust pressure readings, leading to potential performance issues and increased emissions. |
| Possible causes | – Faulty exhaust pressure sensor – High voltage supply – Wiring issues |
| How to diagnose? | – Test the exhaust pressure sensor for high input – Verify voltage supply to the sensor – Inspect wiring for shorts or damage |
P0473 Meaning
The P0473: Exhaust Pressure Sensor ‘A’ Circuit High means that the sensor responsible for monitoring exhaust pressure is sending a voltage signal that is higher than the specified range. This could result from a faulty sensor, excessive voltage supply, or damaged wiring. The incorrect signal can affect engine performance, emissions, and other systems that rely on accurate exhaust pressure readings.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for other related codes that might help diagnose the root cause of the problem. | OBD-II Scanner |
| Inspect the Exhaust Pressure Sensor | Visually inspect the exhaust pressure sensor for signs of damage or disconnection. Make sure it is securely attached. | Flashlight, Safety Gloves |
| Test the Exhaust Pressure Sensor for High Input | Using a multimeter, test the sensor for high voltage input. Compare the voltage readings with the manufacturer’s specifications. | Multimeter, Manufacturer’s Specifications |
| Verify Voltage Supply | Ensure that the voltage supply to the sensor is within the recommended range. If the voltage is too high, inspect the power source and connections for faults. | Multimeter, Vehicle’s Wiring Diagram |
| Inspect Wiring and Connectors | Check the wiring and connectors leading to the exhaust pressure sensor for any signs of short circuits, wear, or damage. | Flashlight, Multimeter |
| Repair or Replace Faulty Components | If faulty wiring or a defective sensor is found, repair or replace the necessary components to restore proper function. | Wire Strippers, Replacement Exhaust Pressure Sensor |
| Clear the Code and Test Drive | After completing repairs, clear the P0473 code using an OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0473 code has not returned. If it does, further diagnosis may be required. | OBD-II Scanner |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)