What it means
Same as P242C on bank 2 sensor 5. 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 5 measures exhaust gas temperature and sends a signal to the control module. P2486 means the signal is lower than expected, often because the signal wire is shorted to ground or a connection is pulling it low; it specifies a low signal rather than a high one.
Common causes
Most likely first.
- Signal shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check-engine light on
How to diagnose it
- Record freeze-frame data and check live data for bank 2 sensor 5 to confirm whether its signal stays low compared with other available temperature readings.
- Inspect the bank 2 sensor 5 connector for moisture, corrosion, loose contact, or a pin pushed back into the housing.
- Trace the signal wire for chafing or exposed conductor that could contact ground near hot or moving parts.
- Following the manufacturer's service information, check the bank 2 sensor 5 circuit for a short to ground and inspect its connections.
- If the wiring is intact, test bank 2 sensor 5 and its signal circuit against the manufacturer's specification.
Common fixes
- Dry and secure the bank 2 sensor 5 connector and correct poor terminal contact.
- Repair chafed wiring or a signal-wire short to ground.
- Replace damaged or corroded bank 2 sensor 5 connector terminals.
- Replace bank 2 sensor 5 if it fails the specified tests after wiring faults are ruled out.
Can I keep driving?
If the engine runs normally and only the check-engine light is on, a short, gentle drive is generally reasonable while you arrange repair. Avoid demanding driving if power changes, since the module may lack dependable exhaust-temperature feedback for 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.