What it means
The module detects an intermittent or erratic signal from the bank 1 sensor 4 exhaust gas temperature sensor circuit. The fault may be in the sensor, wiring, or connection.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 1 sensor 4 measures exhaust gas temperature, and the module checks whether its signal remains stable as operating conditions change. P2472 sets when the circuit signal becomes intermittent or erratic, often because of a loose connection, damaged wiring, or a failing sensor.
Common causes
Most likely first.
- Loose or corroded connector
- Damaged wiring
- Faulty sensor
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 codes to see when the bank 1 sensor 4 signal became erratic.
- Watch the bank 1 sensor 4 live reading while the exhaust warms and compare it with other EGT readings for sudden dropouts or spikes.
- Inspect the connector and harness for looseness, corrosion, chafing, or heat damage, especially near the exhaust.
- With the scan tool monitoring the reading, carefully move the accessible harness to check for a signal change caused by a poor connection.
- Test the sensor and circuit for intermittent faults using the manufacturer's procedure.
- After repair, confirm the reading stays stable through warm-up and a road test where safe.
Common fixes
- Secure a loose bank 1 sensor 4 connector and clean corroded terminals.
- Repair chafed, heat-damaged, or broken wiring in the sensor circuit.
- Replace the sensor if its signal remains erratic during the specified test.
- Replace damaged connector terminals that cannot maintain reliable contact.
Can I keep driving?
If the fault is intermittent and the vehicle runs normally, drive gently and arrange diagnosis soon. Stop or reduce load if power drops or a DPF warning appears, because unstable temperature feedback can interrupt regeneration and 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.