P247C: Exhaust Gas Temperature Out of Range Bank 2 Sensor 1

What it means

The EGT sensor at bank 2 sensor 1 reports a value outside its plausible operating range over time - typically a degraded element giving an offset that the substitute logic flags as implausible.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

Bank 2 sensor 1 measures exhaust gas temperature at its position in the bank 2 exhaust, and the control module checks whether the reading is plausible. P247C sets when bank 2 sensor 1 remains outside its expected range, which may be caused by sensor bias, wiring or connector trouble, contamination, or an exhaust leak near this sensor.

Common causes

Most likely first.

1. Aged or biased exhaust-temperature sensor
2. Damaged wiring or poor connector contact
3. Sensor contaminated or damaged
4. Exhaust leak near the sensor

Symptoms

• Check-engine light on
• Possible reduced engine power
• Possible increased fuel consumption

How to diagnose it

1. Save freeze-frame data and compare bank 2 sensor 1's reading with bank 1 sensor 1 and other exhaust temperatures under similar conditions.
2. With the exhaust cool, inspect bank 2 sensor 1 and its wiring for heat damage, contamination, corrosion, or loose connector contact.
3. Check the exhaust near the bank 2 sensor 1 mounting point for leakage.
4. Watch live readings during warm-up and changing load to see whether bank 2 sensor 1 responds plausibly compared with corresponding sensors.
5. Test bank 2 sensor 1 and its circuit to the manufacturer's specification before deciding whether the sensor needs replacement.

Common fixes

• Repair damaged wiring or poor connector contact at bank 2 sensor 1.
• Repair an exhaust leak close to bank 2 sensor 1.
• Replace a contaminated or damaged bank 2 sensor 1.
• Replace bank 2 sensor 1 if it remains out of specification after circuit checks.

Can I keep driving?

If the vehicle runs normally, short necessary trips are generally reasonable while arranging diagnosis. Avoid heavy loads if power is reduced, since the bank 2 sensor 1 fault can affect emissions control and fuel use.