U0685

Lost Communication With Catalyst Temperature Bank 1 Sensor 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

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

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