P0473 Fault Code

Exhaust Pressure Sensor High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0473 fault code indicates a problem with the exhaust pressure sensor. This sensor measures the pressure in the exhaust system, assisting the engine control unit (ECU) in optimizing air-fuel ratios for combustion efficiency. A high reading from this sensor can lead to incorrect fuel mixtures, affecting engine performance and emissions.

• The exhaust pressure sensor plays a vital role in the emission control system.
• Intermittent or constant high voltage signals might trigger this code.

What are the symptoms of the P0473 code?

Drivers may experience various symptoms when this code triggers:

• Check Engine Light (CEL) illuminated on the dashboard.
• Reduced engine performance, often felt as a loss of power during acceleration.
• Increased fuel consumption due to improper air-fuel mixture.
• Possible rough idling or stalling of the engine in severe cases.

What causes the P0473 code?

Common causes of the P0473 code include:

• A malfunctioning exhaust pressure sensor.
• Wiring issues such as shorts or open circuits in the sensor's harness.
• Corrosion or damage to the connector terminals.
• Faulty engine control unit (ECU) that misreads the sensor data.
• Leaks in the exhaust system prior to the sensor causing incorrect readings.

How to fix P0473?

To resolve the P0473 code, the following steps are recommended:

• Inspect the wiring and connectors leading to the exhaust pressure sensor for damage, corrosion, or loose connections.
• Test the exhaust pressure sensor for proper operation and replace it if defective.
• Check for exhaust leaks upstream of the sensor that might influence the pressure readings.
• Clear the fault code and perform a test drive to confirm the issue is resolved. If the code returns, further diagnostics may be needed to check the ECU or other related components.