U0685
Lost Communication With Catalyst Temperature Bank 1 Sensor 2
U0685 is an OBD-II diagnostic trouble code meaning: Lost Communication With Catalyst Temperature Bank 1 Sensor 2. Common causes: open or short circuit in the wiring to the sensor, malfunction of the catalyst temperature sensor. Estimated repair cost: $17–56.
Symptoms
- Check Engine Light Is On
- Reduced engine performance
- Increased fuel consumption
- Unusual sounds from the exhaust system
Causes
- Open or short circuit in the wiring to the sensor
- Malfunction of the catalyst temperature sensor
- Connector problems or contact corrosion
- Engine control module (ECU) malfunction
How to Fix
- Check the integrity of the sensor wiring and connectors
- Check the resistance of the catalyst temperature sensor
- Check for corrosion in connectors
- Scan the control unit for other errors
Related codes
Error U0685 by Vehicle Brand
FAQ
What does the U0685 code mean?
U0685 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Catalyst Temperature Bank 1 Sensor 2
What causes a U0685 error code?
The most common causes of U0685 include: Open or short circuit in the wiring to the sensor; Malfunction of the catalyst temperature sensor; Connector problems or contact corrosion; Engine control module (ECU) malfunction.
How do I fix a U0685 diagnostic trouble code?
To fix U0685: Check the integrity of the sensor wiring and connectors. Check the resistance of the catalyst temperature sensor. Check for corrosion in connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0685?
Yes, but get it checked soon
How much does it cost to fix U0685?
The estimated repair cost for U0685 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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