P2278
O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3
P2278 is an OBD-II diagnostic trouble code meaning: O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3. Common causes: incorrect connection of o2 sensor connectors, damaged or tangled wiring harness. Estimated repair cost: $22–89.
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
Error P2278 by Vehicle Brand
FAQ
What does the P2278 code mean?
P2278 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3
What causes a P2278 error code?
The most common causes of P2278 include: Incorrect connection of O2 sensor connectors; Damaged or tangled wiring harness; Errors when replacing oxygen sensors; Problems with wiring connectors.
How do I fix a P2278 diagnostic trouble code?
To fix P2278: Check that the O2 sensor connectors are connected correctly. Inspect the wiring harness for damage. Check the integrity of wiring and connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2278?
Yes, but get it checked soon
How much does it cost to fix P2278?
The estimated repair cost for P2278 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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