What it means
The control module monitors the exhaust gas temperature signal from bank 2 sensor 4 and compares it with expected values. It sets this code when the signal is outside the expected range or does not respond plausibly to operating conditions.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 sensor 4 reports exhaust gas temperature, and the control module checks whether its reading is plausible for current operating conditions. P2474 sets when the signal is outside the expected range or does not respond plausibly; it does not identify whether the sensor, circuit, exhaust, or temperature is at fault.
Common causes
Most likely first.
- Faulty exhaust gas temperature sensor
- Damaged wiring or poor connector contact
- Exhaust leak near the sensor
- Abnormal exhaust temperature
Symptoms
- Check engine light on
- DPF or emissions warning light may come on
- Reduced power or limited regeneration may occur
- Increased fuel consumption
How to diagnose it
- Read freeze-frame data and related EGT or DPF codes to see when the bank 2 sensor 4 reading became implausible.
- Compare the live bank 2 sensor 4 reading with other EGT readings and operating conditions using the manufacturer's diagnostic guidance.
- Inspect the sensor, its installation, connector, and nearby wiring for contamination, damage, poor contact, or heat exposure.
- Check for an exhaust leak near bank 2 sensor 4 that could affect its temperature reading.
- Test the sensor and circuit for a plausible response using the manufacturer's procedure before replacing parts.
- If those checks pass, investigate abnormal exhaust temperature or module-related faults suggested by the remaining data.
Common fixes
- Repair damaged wiring or poor connector contact at bank 2 sensor 4.
- Repair a nearby exhaust leak affecting the reading.
- Correct sensor contamination or installation if the manufacturer's procedure permits it.
- Replace bank 2 sensor 4 if testing confirms its reading is out of range or implausible.
- Investigate a module fault only after checking the sensor, circuit, and exhaust.
Can I keep driving?
If the vehicle has normal power and no DPF warning, drive gently and arrange diagnosis soon. Avoid heavy loads if power is reduced or regeneration becomes unusually frequent, as inaccurate bank 2 sensor 4 feedback can interfere with emissions control.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.