The P2473 trouble code is a diagnostic trouble code (DTC) that indicates an issue with the Exhaust Gas Temperature (EGT) Sensor Circuit, specifically for Bank 2, Sensor 4. This code is part of the OBD-II system, which monitors various components of the vehicle’s engine and emissions systems to ensure they are functioning correctly. When the powertrain control module (PCM) detects a malfunction in the EGT sensor circuit, it triggers this code, which can lead to performance issues and increased emissions.
Understanding the meaning and implications of the P2473 code is crucial for vehicle owners and DIY mechanics. This article will provide a comprehensive overview of the P2473 code, including its causes, symptoms, diagnostic steps, and solutions.
| P2473 Code Meaning | P2473 Code Common Causes |
|---|---|
| Exhaust Gas Temperature Sensor Circuit (Bank 2 Sensor 4) malfunction | Faulty EGT sensor |
| Incorrect signal from EGT sensor | Wiring issues (open or shorted) |
| Faulty PCM detection of EGT sensor readings | Poor electrical connection |
| Exhaust system leaks affecting sensor readings | Excessive carbon buildup on sensor |
Symptoms of P2473 Code
When the P2473 code is triggered, it can manifest through various symptoms that may affect vehicle performance. Recognizing these symptoms early can help prevent further damage to the engine or emissions systems.
- Check Engine Light: The most common indication is the illumination of the check engine light on the dashboard.
- Engine Performance Issues: You may notice a decline in engine performance, including stalling or difficulty starting.
- Increased Emissions: The vehicle may produce higher emissions due to improper fuel combustion.
- Reduced Fuel Efficiency: A malfunctioning EGT sensor can lead to decreased fuel economy.
- Overheating: In some cases, overheating of the engine may occur due to improper temperature readings.
Technical Explanation of P2473 Code
The P2473 code relates specifically to the exhaust gas temperature sensor circuit for Bank 2, Sensor 4. This sensor is critical for monitoring exhaust temperatures to ensure optimal engine performance and emissions control.
How It Works
The EGT sensor measures the temperature of exhaust gases as they exit the engine. This information is sent to the PCM, which uses it to adjust fuel injection and ignition timing. If the PCM detects that the readings from Bank 2 Sensor 4 are outside of expected parameters—either too high or too low—it will trigger the P2473 code.
Importance of Proper Functioning
Maintaining accurate readings from the EGT sensor is essential for:
- Fuel Efficiency: Ensures that fuel is burned efficiently, maximizing mileage.
- Emissions Control: Helps minimize harmful emissions by ensuring proper combustion temperatures.
- Engine Longevity: Prevents overheating and potential damage from incorrect temperature readings.
Step-by-Step Diagnosis of P2473 Code
Diagnosing a P2473 code involves a systematic approach to identify the root cause of the malfunction.
Step 1: Scan for Codes
Use an OBD-II scanner to confirm that P2473 is present and check for any additional codes that may provide more context about related issues.
Step 2: Visual Inspection
Conduct a thorough visual inspection of:
- Wiring and Connectors: Look for damaged wires, loose connections, or corrosion at connectors associated with Bank 2 Sensor 4.
- Sensor Condition: Inspect the EGT sensor itself for signs of physical damage or excessive carbon buildup.
Step 3: Test Sensor Operation
Using a multimeter:
- Check the resistance of the EGT sensor according to manufacturer specifications.
- Measure voltage output while running the engine to see if it falls within normal ranges.
Step 4: Inspect Exhaust System
Check for any leaks in the exhaust system that could affect sensor readings. A leak can cause incorrect temperature measurements leading to erroneous PCM signals.
Step 5: Evaluate PCM Functionality
If all other components check out, consider testing or reprogramming the PCM as it may be misinterpreting signals from the EGT sensor.
Solution Methods for P2473 Code
Resolving a P2473 code typically involves replacing faulty components or repairing wiring issues. Here are common solutions:
Replace Faulty EGT Sensor
If diagnostics indicate that Bank 2 Sensor 4 is faulty:
- Disconnect battery power.
- Remove the old sensor using appropriate tools.
- Install a new EGT sensor and reconnect wiring.
Repair Wiring Issues
If damaged wiring or poor connections are found:
- Repair or replace any damaged wires.
- Clean corroded connectors with electrical contact cleaner.
Address Exhaust Leaks
Inspect and repair any leaks in the exhaust system:
- Tighten loose connections or replace gaskets as necessary.
- For larger leaks, consider replacing sections of piping.
Clear Codes and Test Drive
After repairs are made:
- Clear any stored trouble codes using an OBD-II scanner.
- Test drive the vehicle under various conditions to ensure no codes return.
Cost Estimates for Repairs
The cost associated with fixing a P2473 code can vary widely based on several factors including labor rates in your region and whether you choose OEM or aftermarket parts.
- EGT Sensor Replacement: $100 – $300 (including parts and labor)
- Wiring Repairs: $50 – $150 depending on extent of damage
- Exhaust System Repairs: $100 – $500 based on severity and location of leaks
It’s advisable to get quotes from multiple repair shops if you are not performing repairs yourself.
Warnings and Recommendations
- Always disconnect battery power before working on electrical components to avoid shorts or shocks.
- If you are unsure about diagnosing or repairing your vehicle, seek professional assistance to prevent further damage.
- Regularly inspect your vehicle’s exhaust system and sensors as part of routine maintenance to catch issues early.
Closing Paragraph
The P2473 trouble code indicates a significant issue with your vehicle’s exhaust gas temperature sensor circuit that should not be ignored. By understanding its causes, symptoms, and solutions, vehicle owners can take proactive steps toward maintaining their vehicles’ performance and compliance with emissions standards. Whether you choose to diagnose and repair this issue yourself or seek professional help, addressing this code promptly will help ensure your vehicle operates efficiently and safely on the road.
Frequently Asked Questions About P2473
- What does error code P2473 mean?
It indicates a malfunction in the exhaust gas temperature sensor circuit for Bank 2 Sensor 4. - How serious is a P2473 code?
This code can lead to poor engine performance and increased emissions; it’s recommended to address it promptly. - Can I drive my car with a P2473 code?
It’s advisable not to drive until repairs are made due to potential engine damage. - What causes a P2473 code?
Common causes include a faulty EGT sensor, wiring issues, poor connections, or exhaust leaks. - How do I fix error code P2473?
The fix generally involves replacing the faulty EGT sensor or repairing wiring/connectors. - Will clearing codes fix my car?
Clearing codes does not fix underlying issues; repairs must be made first. - How much does it cost to fix a P2473?
Repair costs can range from $100 to $500 depending on parts needed. - Should I consult a mechanic for P2473?
If you’re unsure about diagnosing or repairing it yourself, consulting a mechanic is recommended.