P2473 Code: Complete DIY Repair Guide

The P2473 trouble code is an OBD-II diagnostic code that signals a malfunction in the exhaust gas temperature (EGT) sensor circuit, specifically for Bank 2 Sensor 4. This code indicates that the Powertrain Control Module (PCM) has detected that the exhaust gas temperature readings from this sensor are outside of the expected range, which can lead to performance issues and increased emissions. Understanding this code is crucial for vehicle owners and DIY mechanics, as it can affect engine efficiency and overall vehicle operation.

Symptoms of P2473 Code

When the P2473 code is triggered, several symptoms may manifest:

• Check Engine Light: The most common indication is the illumination of the check engine light on the dashboard.
• Poor Engine Performance: Drivers may experience reduced power, acceleration issues, or rough idling.
• Increased Emissions: A malfunctioning EGT sensor can lead to higher emissions, potentially causing the vehicle to fail emissions testing.
• Fuel Efficiency Decline: The vehicle may consume more fuel than usual due to improper air-fuel mixture adjustments made by the PCM.

Technical Explanation

The exhaust gas temperature sensor monitors the temperature of exhaust gases exiting the engine. This data is crucial for optimizing combustion and reducing emissions. The PCM uses this information to adjust fuel injection and ignition timing. If the readings from Bank 2 Sensor 4 are outside of predefined thresholds, it sets the P2473 code.

How EGT Sensors Work

EGT sensors typically use thermocouples or thermistors to measure temperature. As exhaust gases pass through the sensor, they heat up these components, changing their electrical resistance. The PCM interprets these changes to assess engine performance and emissions control.

Step-by-Step Diagnosis

Diagnosing a P2473 trouble code involves several steps:

1. Scan for Codes: Use an OBD-II scanner to confirm the P2473 code and check for additional trouble codes that may provide further insight into related issues.
2. Visual Inspection: Inspect the wiring and connectors associated with Bank 2 Sensor 4 for signs of damage, corrosion, or loose connections.
3. Check Exhaust System: Look for any leaks in the exhaust system that could affect temperature readings.
4. Test EGT Sensor: Using a multimeter, measure the resistance of the EGT sensor according to manufacturer specifications. If it’s out of range, replace it.
5. Inspect PCM Functionality: If all other components check out, consider testing or reprogramming the PCM as a last resort.

Solution Methods

To resolve a P2473 code, follow these methods:

• Replace Faulty EGT Sensor: If tests indicate that the sensor is defective, replace it with a new one.
• Repair Wiring Issues: Fix any damaged wires or connectors found during inspection. Ensure connections are tight and free from corrosion.
• Fix Exhaust Leaks: Repair any leaks in the exhaust system that could affect readings from the EGT sensor.
• Clear Codes and Test Drive: After repairs, clear any stored codes with an OBD-II scanner and take the vehicle for a test drive to verify that the issue has been resolved.

Cost Estimates

The cost to repair a P2473 code can vary based on several factors:

• EGT Sensor Replacement: Typically ranges from $150 to $500 depending on vehicle make and model.
• Wiring Repairs: Costs can vary widely based on damage extent but expect anywhere from $100 to $300 for labor and parts.
• Exhaust System Repairs: Depending on severity, repairs can range from $50 for minor fixes to over $500 for significant leaks or replacements.

Warnings and Recommendations

• Professional Help Needed: If you are unsure about diagnosing or repairing electrical components or if multiple codes appear, consult a professional mechanic.
• Safety First: Always ensure safety when working under your vehicle; use jack stands and wear appropriate protective gear.
• Regular Maintenance: Regularly inspect exhaust components and sensors during routine maintenance to prevent future issues.

Frequently Asked Questions About P2473

• What does the P2473 fault code mean?
  The P2473 code indicates a malfunction in the exhaust gas temperature sensor circuit for Bank 2 Sensor 4.
• Can I drive my car with a P2473 code?
  While you may be able to drive short distances, it’s best to address this issue promptly to avoid potential damage.
• What are common symptoms of a P2473 code?
  Common symptoms include an illuminated check engine light, poor engine performance, increased emissions, and decreased fuel efficiency.
• How do I diagnose a P2473 code?
  Diagnosing involves scanning for codes, visually inspecting wiring/connectors, checking for exhaust leaks, testing the EGT sensor, and verifying PCM functionality.
• What causes a P2473 code?
  Causes include a faulty EGT sensor, wiring issues, exhaust leaks, corrosion at connections, or excessive particulate buildup.
• How much does it cost to fix a P2473 code?
  The cost can range from $150 to $500 for sensor replacement and varies based on wiring or exhaust repairs needed.
• Is replacing an EGT sensor something I can do myself?
  If you have basic mechanical skills and tools, replacing an EGT sensor is generally manageable.
• What happens if I ignore a P2473 code?
  Ignoring this issue can lead to further engine performance problems and increased emissions over time.

In conclusion, understanding and addressing the P2473 trouble code is essential for maintaining your vehicle’s performance and compliance with emissions standards. By following proper diagnostic procedures and solutions outlined in this guide, DIY mechanics can effectively tackle this issue while ensuring their vehicles run efficiently. Regular maintenance checks will also help prevent such trouble codes from occurring in the future.