U0686

Lost Communication With Catalyst Temperature Bank 2 Sensor 1

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

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

U0685 U0687 U0688