P2472: Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 4
The P2472 code indicates that the Engine Control Module (ECM) has detected an intermittent or erratic signal from the exhaust gas temperature (EGT) sensor located in Bank 1, Sensor 4 (typically downstream of the diesel particulate filter or in the exhaust aftertreatment system). This sensor monitors exhaust temperature to protect components and optimize regeneration. An intermittent signal can be caused by wiring issues, connector corrosion, sensor damage, or exhaust leaks. If left unresolved, it may lead to improper regeneration, reduced fuel economy, or catalytic converter damage.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connectors
- Exhaust leaks near the sensor
- ECM software issues
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Decreased engine performance
- Possible limp mode activation
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, corrosion, or loose connections.
Step 3: Use a multimeter to check sensor resistance and compare to manufacturer specs.
Step 4: Check for exhaust leaks near the sensor location.
Step 5: If wiring and sensor appear okay, clear code and test drive to see if it returns.
4. 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 improper regeneration and potential damage to the exhaust aftertreatment system. Short trips may be okay, but 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 is about $100-$250 depending on accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.