Fault Codes:
Hyundai HX220 NL EPFC 4452（520668-31）
Fault Description:
Aftertreatment outlet NOx sensor closed loop operation -Condition exists.The maximum dosing adjustment has been reached. Closed-loop operation of NOx sensor at the post-treatment outlet - this situation exists. The maximum injection regulation has been reached
Fault Location:
Possible reduced engine performance. It may lead to a decline in engine performance.
