The P2473 trouble code is part of the On-Board Diagnostics II (OBD-II) system and indicates a malfunction in the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 4. This code is significant as it can affect engine performance, emissions, and overall vehicle efficiency. Understanding this code is essential for vehicle owners and DIY mechanics to diagnose and resolve issues effectively.
| P2473 Code Meaning | P2473 Code Common Causes |
|---|---|
| Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 4 Malfunction | Faulty exhaust gas temperature sensor |
| Signal Out of Range from EGT Sensor | Open or short circuit in wiring harness |
| ECM Failure to Recognize Sensor Signal | Corrosion or damage to sensor connectors |
| Inaccurate Exhaust Temperature Readings | Exhaust leaks affecting sensor readings |
| Potential Engine Performance Issues | Improper installation of the EGT sensor |
Symptoms of P2473 Code
When the P2473 code is triggered, several symptoms may manifest, including:
- Check Engine Light: The most common indication of a trouble code.
- Poor Engine Performance: This may include rough idling or a decrease in acceleration.
- Increased Emissions: The vehicle may fail emissions testing due to improper readings from the EGT sensor.
- Fuel Efficiency Decline: A malfunctioning EGT sensor can lead to poor fuel economy as the engine control module (ECM) adjusts fuel delivery based on inaccurate data.
Technical Explanation of P2473 Code
The exhaust gas temperature sensor plays a vital role in monitoring the temperature of exhaust gases, which helps the ECM optimize fuel injection and ignition timing. The P2473 code indicates that the ECM has detected an issue with the signal from the EGT sensor located on Bank 2, Sensor 4. This could be due to various factors such as wiring issues, sensor failure, or even problems within the ECM itself.
Step-by-Step Diagnosis
- Scan for Codes: Use an OBD-II scanner to confirm that the P2473 code is present and check for any additional codes that may provide more context.
- Visual Inspection: Inspect the wiring harness connected to the EGT sensor for any signs of damage, corrosion, or loose connections.
- Check Sensor Functionality: Use a multimeter to test the resistance of the EGT sensor against manufacturer specifications.
- Inspect Exhaust System: Look for any leaks or blockages in the exhaust system that could affect sensor readings.
- Evaluate ECM Functionality: If all other components check out, consider testing or reprogramming the ECM.
Solution Methods for P2473 Code
To resolve issues related to the P2473 code, several methods can be employed:
- Replace Faulty EGT Sensor: If diagnostics indicate that the sensor is not functioning correctly, replacing it is often necessary.
- Repair Wiring Issues: Fix any broken, frayed, or corroded wires in the harness connected to the EGT sensor.
- Clean Connectors: Ensure that all electrical connections are clean and free from corrosion.
- Fix Exhaust Leaks: Address any leaks in the exhaust system that could interfere with accurate temperature readings.
- ECM Replacement/Repair: In rare cases where the ECM is found defective, it may need reprogramming or replacement.
Cost Estimates
The cost to repair issues related to the P2473 code can vary widely based on labor rates and parts prices:
- EGT Sensor Replacement: $150 – $500 depending on vehicle make and model.
- Wiring Repairs: Costs can range from $50 – $200 depending on the extent of damage.
- Labor Costs: Typically between $75 – $150 per hour at most repair shops.
Warnings and Recommendations
- Always ensure that you are using quality replacement parts that meet OEM specifications.
- If you are not comfortable performing these diagnostics or repairs yourself, seek professional assistance to avoid further damage to your vehicle.
Frequently Asked Questions About P2473
- What does the P2473 code mean?
The P2473 code indicates a malfunction in the exhaust gas temperature sensor circuit for Bank 2, Sensor 4. - Can I drive my vehicle with a P2473 code?
While it may be possible to drive short distances, it is recommended to address this issue promptly to avoid potential engine damage. - What are common symptoms of a P2473 code?
Symptoms include an illuminated check engine light, poor engine performance, increased emissions, and reduced fuel efficiency. - How serious is a P2473 code?
This code can lead to significant engine performance issues and increased emissions; thus, it should be addressed as soon as possible. - What causes a P2473 code?
Common causes include a faulty EGT sensor, damaged wiring or connectors, and exhaust leaks. - How can I diagnose a P2473 code?
A proper diagnosis involves scanning for codes, inspecting wiring and connectors, testing the sensor’s functionality, and checking for exhaust system leaks. - Is replacing an EGT sensor difficult?
While it can be done by DIY mechanics with basic tools, it requires knowledge of your vehicle’s specific setup; consult your service manual for details. - When should I seek professional help for a P2473 code?
If you are unable to identify or fix the issue after following diagnostic steps, it’s best to consult a professional mechanic.
In conclusion, understanding and addressing the P2473 trouble code is crucial for maintaining your vehicle’s performance and compliance with emissions standards. By following proper diagnostic procedures and solutions outlined above, vehicle owners and DIY mechanics can effectively resolve this issue while ensuring their vehicles operate efficiently.