What it means
The control module compares the bank 2 sensor 5 exhaust-gas temperature signal with the range or behavior expected under current operating conditions. It sets this code when the signal is implausible or does not respond as expected, even if the circuit is not clearly open or shorted.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 sensor 5 measures exhaust gas temperature, and the control module checks whether its signal changes plausibly with operating conditions. P2488 sets when the signal is out of range or behaves unexpectedly, even though the circuit may not have a clear open or short.
Common causes
Most likely first.
- Exhaust-temperature sensor drift or damage
- Poor connector contact or corrosion
- Damaged or chafed wiring
- Exhaust leak affecting sensor readings
Symptoms
- Check-engine light on
- Possible reduced engine power
- Possible increased fuel consumption
How to diagnose it
- Record freeze-frame data and compare bank 2 sensor 5 live readings with other available exhaust-temperature readings as the engine warms and conditions change.
- With the exhaust cool, inspect bank 2 sensor 5 and its connector for physical damage, contamination, corrosion, or loose contact.
- Check the bank 2 sensor 5 wiring for heat damage, chafing, or poor connections near the exhaust and moving parts.
- Inspect exhaust joints near bank 2 sensor 5 for leaks that could affect the reading.
- Test the sensor response and circuit against the manufacturer's specification after ruling out wiring and exhaust leaks.
Common fixes
- Secure the bank 2 sensor 5 connector and repair damaged wiring.
- Repair an exhaust leak near bank 2 sensor 5.
- Clean or replace a contaminated or damaged sensor if serviceable.
- Replace bank 2 sensor 5 if its response remains implausible after circuit checks.
Can I keep driving?
If the engine runs normally and the warning light is steady, a short, gentle drive is generally reasonable while you arrange diagnosis. Avoid heavy loads if power drops, since unreliable exhaust-temperature feedback can affect emissions control and fuel use.
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.