P2473: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 4
The P2473 code indicates a problem with the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 4. This sensor monitors exhaust temperature to protect the diesel particulate filter (DPF) and catalytic converter from overheating. The Engine Control Module (ECM) detects an abnormal voltage or signal from the sensor, often due to a faulty sensor, wiring issues, or exhaust leaks. This code is common in diesel vehicles with DPF systems.
01. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in sensor circuit
- Poor electrical connection at sensor or ECM
- Exhaust leak near sensor affecting readings
- Corroded or damaged sensor connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased exhaust emissions
- Possible DPF regeneration issues
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test sensor resistance and compare to manufacturer specs.
Step 4: Check for exhaust leaks near the sensor location.
Step 5: If sensor and wiring are okay, test the circuit at the ECM connector for continuity and shorts.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to DPF damage or overheating. You may experience reduced performance or limp mode. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor adds $100-$250 depending on accessibility.