P2278

O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$22–89 (est.)

Symptoms

Check Engine Light Is On
Slight deterioration in fuel consumption
Minor failures in engine operation are possible
Increased emissions
Possible errors with other O2 sensors

Causes

Incorrect connection of O2 sensor connectors
Damaged or tangled wiring harness
Errors when replacing oxygen sensors
Problems with wiring connectors
Malfunction of the oxygen sensor itself

How to Fix

Check that the O2 sensor connectors are connected correctly
Inspect the wiring harness for damage
Check the integrity of wiring and connectors
If necessary, replace damaged wires or connectors
If the problem persists, replace the oxygen sensors

Related codes

P2277 P2279 P0137 P0157