The P2473 trouble code is a diagnostic trouble code (DTC) that indicates a malfunction in the Exhaust Gas Temperature (EGT) Sensor Circuit for Bank 2, Sensor 4. This code is part of the OBD-II system, which monitors various components of a vehicle’s engine and exhaust system to ensure optimal performance and emissions control. When the Engine Control Module (ECM) detects an issue with the EGT sensor’s signal, it triggers the P2473 code, illuminating the Check Engine Light on the dashboard. Understanding this code is essential for vehicle owners and DIY mechanics, as it can lead to serious engine performance issues if not addressed promptly.
| P2473 Code Meaning | P2473 Code Common Causes |
|---|---|
| Exhaust Gas Temperature Sensor Circuit Malfunction (Bank 2 Sensor 4) | Faulty EGT sensor |
| Signal Interruption in EGT Circuit | Open or short circuit in wiring |
| Incorrect EGT Sensor Installation | Corrosion or damage to connectors |
| ECM Malfunction Related to EGT Monitoring | Exhaust system leaks or blockages |
| Temperature Readings Out of Specification | Incorrect fuel type or quality |
Symptoms
When the P2473 code is triggered, you may notice several symptoms that can affect your vehicle’s performance:
- Check Engine Light: The most immediate sign is the illumination of the Check Engine Light on your dashboard.
- Poor Engine Performance: You might experience reduced power, sluggish acceleration, or stalling due to improper fuel injection adjustments.
- Increased Emissions: A malfunctioning EGT sensor can lead to higher emissions, potentially causing your vehicle to fail emissions tests.
- Unusual Exhaust Odors: You may notice strange smells from the exhaust, indicating incomplete combustion.
- Overheating: In severe cases, a faulty sensor can lead to overheating of engine components due to incorrect temperature readings.
Technical Explanations
The Exhaust Gas Temperature Sensor is crucial for monitoring the temperature of exhaust gases in modern vehicles. It helps the ECM optimize fuel injection and ignition timing to enhance performance and minimize emissions. The P2473 code specifically refers to Bank 2, which is typically the side of a V-engine opposite Bank 1, and Sensor 4 in the sequence of EGT sensors.
The sensor operates by generating a voltage signal that varies with temperature. If this signal deviates from expected parameters—due to a faulty sensor, wiring issues, or other related problems—the ECM will trigger the P2473 code. This can lead to incorrect calculations for air-fuel ratios and potentially damage critical components like catalytic converters if left unresolved.
Step-by-Step Diagnosis
To accurately diagnose and repair the P2473 trouble code, follow these steps:
- Scan for Codes: Use an OBD-II scanner to confirm the presence of the P2473 code and check for any additional codes that may provide context.
- Visual Inspection: Inspect the exhaust gas temperature sensor and its wiring harness for visible damage such as fraying, corrosion, or disconnections.
- Connector Check: Examine all connectors associated with the EGT sensor for signs of wear or corrosion that could interrupt signal transmission.
- Test Sensor Functionality: Using a multimeter, measure the resistance of the EGT sensor while comparing it to manufacturer specifications. An out-of-range reading indicates a faulty sensor.
- Check Wiring Integrity: Perform continuity tests on the wiring harness to ensure there are no breaks or shorts in the circuit.
- Inspect Exhaust System: Look for leaks or blockages in the exhaust system that could affect temperature readings.
- Clear Codes and Retest: After repairs are made, clear the codes using an OBD-II scanner and take the vehicle for a test drive to see if the P2473 code returns.
Solution Methods
Addressing a P2473 code involves several potential solutions depending on the underlying cause:
- Replace Faulty EGT Sensor: If testing reveals that the sensor is defective, replacing it is usually straightforward and often resolves the issue.
- Repair Wiring Issues: If damaged wiring is found during inspection, repair or replace affected sections of wiring harnesses as necessary.
- Clean Connectors: Corroded connectors should be cleaned or replaced to ensure proper electrical contact.
- Fix Exhaust Leaks: Any leaks found in the exhaust system should be repaired to prevent incorrect temperature readings.
- ECM Reprogramming/Replacement: In rare cases where other solutions do not resolve the issue, reprogramming or replacing the ECM may be necessary.
Cost Estimates
The cost of diagnosing and repairing a P2473 code can vary widely depending on several factors:
- EGT Sensor Replacement: Typically ranges from $150 to $500 USD depending on make and model; parts alone can cost between $75 and $200 USD.
- Wiring Repairs: Costs vary based on extent; minor repairs may be under $100 USD while extensive rewiring could exceed $300 USD.
- Labor Costs: Expect labor charges ranging from $75 to $150 per hour depending on your location and mechanic’s rates.
Warnings and Recommendations
- Always use OEM parts when replacing components related to emissions systems to ensure compatibility and reliability.
- If you are not comfortable performing electrical diagnostics or repairs, consider seeking professional assistance to avoid further complications.
- Regularly inspect your vehicle’s exhaust system as part of routine maintenance to catch potential issues early before they escalate into more significant problems.
Closing Paragraph
The P2473 trouble code signifies a critical issue within your vehicle’s exhaust gas temperature monitoring system. Prompt diagnosis and repair are essential not only for maintaining optimal engine performance but also for ensuring compliance with emissions regulations. By understanding this code and following systematic troubleshooting steps, vehicle owners and DIY mechanics can effectively address this issue while potentially saving on costly repairs down the line.
Frequently Asked Questions About P2473
- What does error code P2473 mean?
P2473 indicates a malfunction in the Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 4), affecting engine performance and emissions. - How serious is a P2473 code?
This code can lead to significant engine issues if left unresolved, including increased emissions and potential damage to components like catalytic converters. - Can I drive my car with a P2473 code?
While you can drive with this code present, it’s advisable to address it promptly to avoid further damage. - How do I fix error code P2473?
Fixing this error typically involves inspecting and possibly replacing the EGT sensor or repairing any related wiring issues. - Will clearing the code fix my car?
No; clearing the code will not solve underlying issues; it will only turn off the Check Engine Light temporarily. - What tools do I need to diagnose P2473?
An OBD-II scanner and a digital multimeter are essential tools for diagnosing this trouble code. - How long does it take to repair a P2473 code?
The time required can vary; replacing an EGT sensor typically takes about 0.5 – 1 hour. - Can I replace an EGT sensor myself?
If you have basic mechanical skills and tools, replacing an EGT sensor is generally manageable for DIY mechanics.