Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 1 Sensor 5
The P2484 code indicates an intermittent or erratic signal from the exhaust gas temperature (EGT) sensor located in Bank 1, Sensor 5 (typically downstream of the diesel particulate filter or in the exhaust aftertreatment system). This sensor monitors exhaust temperature for regeneration and emissions control. An intermittent fault may cause incorrect temperature readings, leading to improper regeneration cycles, reduced fuel efficiency, or potential damage to the DPF or catalytic converter.
1. Most Common Causes
- Faulty EGT sensor (Bank 1 Sensor 5)
- Damaged or corroded wiring/connector to the sensor
- Intermittent short or open in the sensor circuit
- Exhaust system leaks near the sensor
- ECU software issues or calibration errors
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Poor engine performance or hesitation
- DPF regeneration issues (frequent or incomplete regen)
- Possible limp mode activation
3. Step-by-Step Diagnosis
Step 1: Scan the vehicle with an OBD2 scanner to confirm P2484 and check for other related codes.
Step 2: Visually inspect the EGT sensor (Bank 1 Sensor 5) and its wiring/connector for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the sensor's resistance and compare with manufacturer specifications (typically 100-200 kΩ at room temperature).
Step 4: Check for exhaust leaks near the sensor that could cause erratic readings.
Step 5: If wiring and sensor appear okay, perform a wiggle test on the harness while monitoring live data to isolate intermittent faults.
Step 6: Replace the sensor if faulty; clear codes and test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with this code, as it can lead to improper DPF regeneration, reduced fuel economy, and potential damage to exhaust components. 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 (EGT sensor $50-$150) and labor (1-2 hours at $100-$150 per hour).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.