P221B

NOx Sensor 1/2 Correlation Bank 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Problems with passing inspection due to emissions
Possible transition to emergency mode

Causes

NOx sensor 1 or 2 fault on Bank 2
Damage to the wiring to the NOx sensors
Problems with sensor connectors
Engine control unit malfunction
Problems with the SCR system

How to Fix

Check the condition of the wiring and connectors of the NOx sensors
Read operating parameters of NOx sensors using a scanner
Check the functionality of NOx sensors
If necessary, replace the faulty NOx sensor
Check the operation of the SCR system

Related codes

P2200 P2201 P221A