U0686
Lost Communication With Catalyst Temperature Bank 2 Sensor 1
U0686 is an OBD-II diagnostic trouble code meaning: Lost Communication With Catalyst Temperature Bank 2 Sensor 1. Common causes: malfunction of the catalyst temperature sensor, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Possible problems starting the engine
- Unstable engine idling
Causes
- Malfunction of the catalyst temperature sensor
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Engine control unit (ECU) malfunction
- Wiring harness damage
How to Fix
- Check the continuity of the catalyst temperature sensor circuit
- Inspect the sensor connector for corrosion or damage.
- Check the resistance of the catalyst temperature sensor
- If necessary, replace the catalyst temperature sensor
- Check and replace wiring harness if necessary
Related codes
Error U0686 by Vehicle Brand
FAQ
What does the U0686 code mean?
U0686 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Catalyst Temperature Bank 2 Sensor 1
What causes a U0686 error code?
The most common causes of U0686 include: Malfunction of the catalyst temperature sensor; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Engine control unit (ECU) malfunction.
How do I fix a U0686 diagnostic trouble code?
To fix U0686: Check the continuity of the catalyst temperature sensor circuit. Inspect the sensor connector for corrosion or damage.. Check the resistance of the catalyst temperature sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0686?
Yes, but get it checked soon
How much does it cost to fix U0686?
The estimated repair cost for U0686 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat