Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 2 Sensor 4
The P2474 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the exhaust gas temperature (EGT) sensor located on Bank 2, Sensor 4 (downstream of the diesel particulate filter or catalytic converter). This sensor monitors exhaust temperature for emissions control and regeneration processes. The ECM compares the sensor's signal to expected values; if the signal is out of range or responds too slowly, the code sets. Common causes include a faulty sensor, wiring issues, exhaust leaks, or contamination.
1. Most Common Causes
- Faulty exhaust gas temperature sensor
- Damaged or corroded wiring/connector
- Exhaust system leaks near the sensor
- Contaminated sensor (soot, oil, coolant)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Possible limp mode or reduced engine power
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P2474 and check for other codes.
Step 2: Visually inspect the EGT sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage with a multimeter; compare to manufacturer specs.
Step 4: Check for exhaust leaks near the sensor that could affect readings.
Step 5: If sensor and wiring are okay, replace the EGT sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances, as the issue can affect emissions and regeneration, potentially leading to more serious problems like clogged DPF or catalytic converter damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY sensor replacement, or $150 to $300 if professionally installed, depending on labor rates and sensor price.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.