U0621
Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 1
U0621 is an OBD-II diagnostic trouble code meaning: Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 1. Common causes: exhaust temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $28–89.
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
Error U0621 by Vehicle Brand
FAQ
What does the U0621 code mean?
U0621 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Exhaust Gas Temperature Sensor Bank 2 Sensor 1
What causes a U0621 error code?
The most common causes of U0621 include: Exhaust temperature sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Corroded or damaged wiring.
How do I fix a U0621 diagnostic trouble code?
To fix U0621: Check the integrity of the sensor circuit. Inspect the sensor connector and contacts. Check sensor resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0621?
Yes, but get it checked soon
How much does it cost to fix U0621?
The estimated repair cost for U0621 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat