P0473 – OBD-II DTC

OBD-II DTC P0473 – Exhaust Pressure Sensor Low

DTC P0473 meaning

DTC P0473 refers to a diagnostic trouble code indicating that the exhaust pressure sensor is reporting a low voltage signal. This sensor is crucial for monitoring the pressure in the exhaust system, which helps in optimizing engine performance and emissions control. When the Engine Control Module (ECM) detects a voltage reading from the exhaust pressure sensor that is lower than the expected range, it triggers this code.

DTC P0473 symptoms

Common symptoms associated with DTC P0473 may include:

• Illuminated check engine light
• Decreased engine performance
• Increased fuel consumption
• Rough idling or stalling
• Failed emissions test

DTC P0473 causes

Several factors can lead to the triggering of DTC P0473, including:

• Faulty exhaust pressure sensor
• Wiring issues, such as damaged or corroded connectors
• Short circuits in the sensor circuit
• Faulty Engine Control Module (ECM)
• Exhaust system leaks

DTC P0473 seriousness

DTC P0473 can be considered serious as it may affect engine performance and emissions. If left unaddressed, it can lead to further engine damage or increased emissions, potentially resulting in failing emissions tests. It is advisable to diagnose and repair the issue promptly to maintain vehicle performance and compliance with environmental regulations.

How to diagnose DTC P0473

To diagnose DTC P0473, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the exhaust pressure sensor and its wiring for any visible damage or corrosion.
3. Check the voltage and ground signals at the sensor using a multimeter.
4. Test the exhaust pressure sensor by comparing its readings to manufacturer specifications.
5. Inspect the exhaust system for any leaks that may affect sensor readings.
6. Clear the code and perform a test drive to see if the code reappears.

How to fix DTC P0473 step-by-step instructions

To fix DTC P0473, follow these steps:

1. Identify and repair any damaged wiring or connectors related to the exhaust pressure sensor.
2. If the exhaust pressure sensor is faulty, replace it with a new one.
3. Ensure that the exhaust system is free of leaks and properly sealed.
4. Reconnect all electrical connections and ensure they are secure.
5. Clear the DTC using an OBD-II scanner.
6. Perform a test drive to verify that the code does not return and that the vehicle operates normally.

How to erase DTC P0473

To erase DTC P0473, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to ensure the code does not reappear.

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