P2473: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 4
The P2473 code indicates a malfunction in 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 powertrain control module (PCM) detects an abnormal voltage or resistance in the sensor circuit, often due to a faulty sensor, wiring issues, or exhaust leaks. This code is common in diesel engines with DPF systems.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Open or shorted wiring in sensor circuit
- Poor electrical connection at sensor or PCM
- Exhaust leak near sensor affecting readings
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased exhaust emissions
- Possible DPF regeneration issues
3. 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 or corrosion.
Step 3: Test sensor resistance and compare to manufacturer specs.
Step 4: Check for exhaust leaks near the sensor.
Step 5: Repair or replace faulty sensor or wiring as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to DPF damage or catalytic converter failure. Limp mode may reduce power.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor location and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.