P0472 Low input of the exhaust pressure sensor

P0472 – Technical description of the OBD-II fault code

Trouble code P0472 indicates low exhaust pressure sensor input signal

What does the fault code mean P0472?

Trouble code P0472 indicates a problem in the exhaust gas pressure sensor circuit. This means that the sensor is not transmitting correct exhaust pressure data, which may be due to a malfunction of the sensor itself or its electrical circuit.

Possible reasons

Some possible reasons for the P0472 trouble code:

• Exhaust gas pressure sensor malfunction: The sensor itself may be damaged or fail due to wear, corrosion or other reasons.
• Electrical circuit problems: Opens, corrosion, or damage in the electrical circuit connecting the exhaust gas pressure sensor to the engine control module (PCM) may result in incorrect readings or no signal from the sensor.
• Engine Control Module (PCM) malfunction: In rare cases, the problem may be due to a malfunction of the PCM itself, which processes data from the exhaust gas pressure sensor.
• Installation problems or mechanical damage: Incorrect installation of the sensor or mechanical damage in the sensor area may result in improper operation.
• Problems with the intake system or exhaust system: Irregular pressure in the exhaust or intake system can also cause the P0472 code.

What are the symptoms of a fault code? P0472?

Symptoms for DTC P0472 may include:

• Error appearing on the dashboard: This may include the appearance of a Check Engine Light or other warning messages.
• Loss of engine power: Incorrect exhaust pressure data may cause the engine to go into limp mode, which may affect power and performance.
• Uneven engine operation: Incorrect exhaust pressure data may result in rough or unstable engine operation.
• Exhaust problems: Problems with exhaust gas pressure can lead to increased emissions of harmful substances in the exhaust gases, which may lead to non-compliance with environmental standards.
• Fuel consumption problems: Improper operation of the exhaust gas pressure sensor may affect fuel consumption, which may result in increased fuel consumption or reduced engine efficiency.

How to diagnose a fault code P0472?

To diagnose DTC P0472, the following steps are recommended:

1. Check the error code: Using a diagnostic scan tool, check for trouble code P0472 and any other codes that may accompany it. This will help determine if there are additional problems that may be affecting system performance.
2. Visual inspection of the exhaust gas pressure sensor: Check the exhaust gas pressure sensor for visible damage, corrosion or connection problems.
3. Electrical circuit check: Check the electrical circuit connecting the exhaust gas pressure sensor to the engine control module (PCM) for opens, corrosion, or other damage. Make sure all connections are secure.
4. Pressure sensor testing: Using a multimeter, check the exhaust gas pressure sensor for abnormal operation. This can be done by removing the sensor and measuring its resistance or voltage under specified conditions.
5. Checking the exhaust system: Check the condition of the exhaust system for leaks, damage or other problems that may affect exhaust gas pressure.
6. Additional tests: Depending on your vehicle's specific characteristics and symptoms, additional tests may be required, such as testing the engine control module (PCM) or checking the exhaust pressure using a gauge.

If you are unsure of your skills or experience, it is best to contact a qualified mechanic or auto repair shop for more accurate diagnosis and repair.

Diagnostic errors

When diagnosing DTC P0472, the following errors may occur:

• Skipping important steps: One common mistake is underdiagnosis, where important steps such as visual inspection, electrical circuit inspection, or sensor testing are missed.
• Misinterpretation of data: Sometimes mechanics may misinterpret diagnostic data, which can lead to incorrect identification of the source of the problem.
• Replacement of parts without diagnostics: Replacing parts without prior diagnosis may result in replacement of serviceable components and may not eliminate the source of the problem.
• Ignoring additional symptoms: Some problems may have multiple symptoms, and ignoring them can lead to misdiagnosis.
• Tool malfunction: Using faulty or uncalibrated diagnostic tools may lead to incorrect results.
• Insufficient experience or knowledge: Insufficient experience or knowledge of the exhaust system and engine operation can also lead to diagnostic errors.

How serious is the fault code? P0472?

Trouble code P0472 indicates a problem with the exhaust gas pressure sensor circuit. Although this is not a critical malfunction, it can lead to some problems such as loss of engine power, rough running of the engine, or increased emissions of harmful substances in the exhaust. In addition, the occurrence of an error may affect the vehicle's performance and may cause problems during maintenance or emission testing. It is important to fix the problem as soon as possible to avoid further damage or deterioration in vehicle performance.

What repair will help eliminate the code? P0472?

The following repairs may be required to resolve DTC P0472:

1. Replacing the exhaust gas pressure sensor: If the exhaust gas pressure sensor fails or does not work properly, it should be replaced with a new one.
2. Electrical circuit repair: If the problem is related to the electrical circuit, it is necessary to identify and repair breaks, corrosion or damage in the wires, connectors or contacts.
3. Exhaust system inspection and maintenance: Problems with the exhaust system, such as leaks or blockages, can cause trouble code P0472. In this case, careful diagnosis and repair of this system is required.
4. Engine Control Module (PCM) Firmware: Sometimes updating or flashing the PCM software can help resolve the error, especially if the problem is due to a software bug.
5. Diagnostics of other systems: Since the P0472 code can be related to other components of the vehicle, it is important to conduct a complete diagnosis of all exhaust and electronic related systems to completely eliminate the problem.

To properly repair and resolve the P0472 code, it is recommended that you contact a qualified mechanic or auto repair shop, especially if you are not experienced in diagnosing and repairing vehicles.

P0472 Exhaust Pressure Sensor "A" Circuit Low 🟢 Trouble Code Symptoms Causes Solutions

P0472 – Brand-specific information

Trouble code P0472 can apply to various makes and models of vehicles, some of them are:

• Ford: High pressure in the EGR system.
• Chevrolet: Exhaust gas pressure sensor “B” – low input signal.
• Dodge: Exhaust gas pressure sensor 2 – low input voltage.
• Toyota: Intake manifold air pressure control system - low voltage.
• Nissan: Exhaust gas pressure sensor - low input signal.
• Volkswagen: Exhaust gas recirculation system - low voltage.
• Mercedes-Benz: Exhaust gas pressure sensor 2 – low voltage.
• BMW: Exhaust gas pressure sensor 1 – signal too low.
• Audi: Exhaust gas recirculation system - signal too low.
• Honda: Low voltage in the exhaust gas pressure sensor circuit.

These are just a few examples, and the interpretation of trouble codes may vary depending on the specific model and year of the vehicle. For more accurate information, please refer to the official repair or service manuals for your specific vehicle make and model.