U0621

Lost Communication With Exhaust Gas Temperature Sensor 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
Switching to emergency mode
Increased fuel consumption
Unstable engine operation

Causes

Exhaust temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Corroded or damaged wiring
Engine control unit malfunction

How to Fix

Check the integrity of the sensor circuit
Inspect the sensor connector and contacts
Check sensor resistance
Replace the faulty sensor if necessary
Reset the error and check the system operation

Related codes

U0622 P0546 P0544