What it means
The module detects an open or other circuit fault in the bank 2 sensor 4 exhaust gas temperature sensor circuit. The code does not establish that the sensor itself is faulty.
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 measures exhaust gas temperature, and the control module monitors its circuit for a usable signal. P2473 indicates an open or other circuit fault on the bank 2 sensor 4 circuit; it does not by itself prove that the sensor has failed.
Common causes
Most likely first.
- Open or damaged wiring
- Loose or corroded connector
- 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 or DPF codes to identify when the bank 2 sensor 4 circuit fault occurred.
- Locate bank 2 sensor 4 using service information and inspect its connector and nearby wiring for looseness, corrosion, breaks, or heat damage.
- Check the harness routing near the exhaust for chafing, melted insulation, or an open wire.
- Test the bank 2 sensor 4 circuit for an open and check its power, ground, and connector terminals using the manufacturer's wiring diagram.
- Test the sensor against the manufacturer's specification to separate a sensor fault from a wiring fault.
- After repair, verify that the bank 2 sensor 4 reading is present and responds plausibly as the exhaust warms.
Common fixes
- Reconnect or clean a loose or corroded bank 2 sensor 4 connector.
- Repair an open or heat-damaged wire in the bank 2 sensor 4 circuit.
- Repair a confirmed power or ground fault affecting that circuit.
- Replace bank 2 sensor 4 if testing confirms the sensor has failed.
Can I keep driving?
If the vehicle runs normally, a short, gentle trip to arrange diagnosis may be possible; avoid heavy loads and prolonged high-speed driving. Missing bank 2 sensor 4 feedback can limit regeneration or emissions control and may result in reduced power.
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.