What it means
Same as P242C on bank 2 sensor 4. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
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 at its position in the exhaust, often as part of emissions or DPF monitoring. The engine control module flags P2475 when this sensor's signal is lower than the expected range, which can happen if the signal wire is shorted to ground or its connection has excessive resistance.
Common causes
Most likely first.
- Signal shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
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
- Use a scan tool to save freeze-frame data and compare bank 2 sensor 4's reading with other exhaust temperature readings under similar conditions.
- With the exhaust cool, locate bank 2 sensor 4 and inspect its connector and harness for moisture, corrosion, pushed-back pins, or chafing.
- With live data displayed, gently move the sensor 4 harness and connector to see whether its reading changes or the fault returns.
- Check the sensor signal circuit for a short to ground and inspect connector contact quality, following the vehicle wiring diagram.
- If the wiring and connector pass inspection, test bank 2 sensor 4 and its circuit against the manufacturer's specification before replacing the sensor.
Common fixes
- Clean and secure the bank 2 sensor 4 connector, repairing corroded or pushed-back terminals.
- Repair chafed wiring and secure the harness away from hot or moving parts.
- Repair a signal wire short to ground.
- Replace bank 2 sensor 4 if it fails the specified circuit test.
Can I keep driving?
If the engine runs normally and no warning indicates a DPF or emissions-system problem, a short trip to a repair location is generally reasonable. Avoid prolonged driving or heavy loads if power is reduced or regeneration is limited, since emissions-system operation may worsen.
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.