P2473 — Exhaust Gas Temperature Sensor Circuit

The diagnostic trouble code P2473 indicates an issue with the exhaust gas temperature sensor circuit. This sensor plays a key role in monitoring the temperature of exhaust gases, particularly in systems like diesel particulate filters (DPFs) or exhaust aftertreatment components. When this code appears, it generally suggests a problem with the sensor’s electrical circuit, such as a wiring fault or a malfunctioning sensor. Note that the labels or terminology may vary slightly between different vehicle manufacturers.

Manufacturer variations for trouble code P2473

Different vehicle manufacturers may label or record the code P2473 differently. These manufacturer-specific labels can help practitioners quickly identify the nature of the fault according to each OEM’s standards. The variations are often related to how the sensor circuit is referenced or identified in the vehicle’s electronic system.

• Ford: P2473 – « Exhaust Gas Temperature Sensor Circuit High » (or « Circuit Low » depending on context)
• Honda: P2473 – « Exhaust Gas Temperature Sensor Malfunction »
• Volkswagen/Audi: Similar labels, often associated with specific sensor circuit issues in TDI engines
• Mercedes-Benz: Variations include related sensor circuit faults or temperature sensor issues
• Other/OEM-specific labels: The code might be integrated under broader exhaust system diagnostics

What does trouble code P2473 mean?

P2473 signifies that the engine control unit (ECU) has detected an abnormality within the exhaust gas temperature sensor circuit. Essentially, the ECU continuously monitors the sensor’s electrical signals to ensure it’s reading and functioning correctly. If the circuit’s voltage, resistance, or signal frequency deviates from acceptable parameters—due to a fault like a short circuit, open circuit, or faulty sensor—the ECU flags this fault as code P2473.

This problem could be triggered by various issues, such as damaged wiring, loose connections, or a defective sensor. And it often appears during routine diagnostics or when the system detects abnormal exhaust temperature readings. Typically, this code emerges when the engine is in operation—especially during certain loads or deceleration, when sensor readings are crucial for the system’s functions.

Severity and risks of trouble code P2473

The presence of P2473 indicates a moderate risk; it primarily impacts the exhaust aftertreatment system, particularly in diesel engines with DPFs. If ignored, it can lead to inefficient combustion, increased emissions, and potential damage to the exhaust components over time. In some cases, the vehicle may enter a limp mode to protect critical systems, reducing power and drivability.

However, in most situations, the vehicle can be driven temporarily, but it’s advisable to perform a proper diagnosis and repair in the short term to prevent further damage or pollution.

Symptoms of trouble code P2473

Although some vehicles may show no immediately noticeable symptoms, others might display signs indicating exhaust system issues, such as:

• Illuminated Check Engine light or other warning lights on the dashboard
• Reduced engine performance or power loss
• Rough idling or irregular engine behaviour
• Increased emissions or failed emissions tests
• Possible fuel consumption increase
• Poor acceleration or hesitations

Most likely causes of trouble code P2473

Understanding the root causes of P2473 is essential for effective repair. These causes are generally related to electrical circuit integrity or sensor health. The causes listed below are in order of their commonality:

1. Damaged or corroded wiring or connectors in the exhaust gas temperature sensor circuit. External elements like mud, water, or road salt can accelerate corrosion, disrupting signal transmission.
2. Faulty exhaust gas temperature sensor. The sensor itself may be defective or worn out after high mileage or exposure to extreme temperatures.
3. Open or shorted wiring circuits. Damage due to frayed wiring, pinched cables, or incorrect repairs can cause circuit faults.
4. ECU software or firmware issues. Although rare, incorrect or outdated software can lead to misinterpretation of signals.
5. Problems in the vehicle’s grounding system. Poor grounding can cause erratic sensor readings.

How to diagnose trouble code P2473

Diagnosing P2473 involves a systematic approach to confirm the root cause. Here are the typical steps:

1. Perform a visual inspection of wiring, connectors, and the sensor itself. Look for visible damage, corrosion, or loose connections.
2. Check the wiring harness continuity using a multimeter to ensure there are no open circuits or shorts between the sensor and ECU.
3. Test the sensor’s electrical signal. Measure the output voltage or resistance at the sensor connector according to the manufacturer’s specifications.
4. Clear the DTCs and re-test. Drive the vehicle under different conditions and verify if the code reappears.
5. Use live data monitoring through an OBD-II scanner to observe real-time readings from the exhaust gas temperature sensor.
6. Inspect for exhaust leaks or blockages that could affect sensor readings.

Possible repairs for trouble code P2473

The repairs necessary depend on the identified cause during diagnosis. Common repairs include:

• Replace damaged wiring or connectors. This is a basic repair, often performed by a technician or an experienced DIYer.
• Install a new exhaust gas temperature sensor. A straightforward repair, typically requiring basic tools and a sensor-specific part.
• Fix grounding issues. Ensuring proper grounding connections and cleaning contact points may resolve the fault—generally a basic repair.
• Update or reflash ECU software. Usually a professional job performed by a dealership or specialised repair shop.
• Address exhaust system problems, such as leaks or blockages, which may affect sensor performance. Requires professional diagnosis and repair.

Vehicles commonly associated with trouble code P2473 in Europe

This diagnostic code appears most frequently in diesel vehicles equipped with advanced exhaust aftertreatment systems, especially in regions with strict emissions standards. Models from various brands may be affected, particularly in the context of diesel engines with DPFs.

Additionally, certain engine families and vehicle types are more prone—usually due to the use of similar sensors and exhaust configurations.

• Volkswagen Group: TDI engines in Polo, Golf, Passat, and Tiguan
• Ford: Diesel engines in Transit, Ranger, and Fiesta
• Volkswagen: TDI models in Jetta, Tiguan, and Touareg
• Peugeot/Citroën: Diesel engines with common aftertreatment systems
• Mercedes-Benz: Diesel models with selective catalytic reduction (SCR) systems

Frequent mistakes with trouble code P2473

Diagnosing and repairing P2473 can be complicated by common pitfalls. Here are some mistakes to avoid:

• Neglecting the wiring inspection. Focusing only on the sensor without checking circuit integrity is a frequent error.
• Replacing the sensor without verifying circuit faults. New sensors can also fail if wiring issues aren’t addressed.
• Overlooking the possibility of exhaust leaks, which can skew sensor readings and cause misdiagnosis.
• Ignoring transmission or engine load conditions during testing. The sensor output may vary with driving conditions, leading to misinterpretation.

FAQ — trouble code P2473

Can this code disappear on its own?

Normally, P2473 will not clear automatically unless the underlying issue is fixed. Short-term glitches in wiring or sensor signals may temporarily reset the code, but it will usually return unless repaired.

Can I keep driving?

Yes, in most cases, the vehicle can be driven but with limitations. The engine may enter limp mode, or exhaust emissions might increase. It’s advisable to address the fault promptly to prevent long-term damage.

Why does the code return after clearing?

This indicates an ongoing problem such as wiring damage, failing sensor, or exhaust system issue. Simply clearing the fault without fixing the cause results in the code reappearing.