The CEL is on in my 93 190e 2.3 4cyl. Diagnosis returned code 4 - airflow sensor position indicator. I installed a new pot (the existing pot was just fine without any wear)& adjusted to specs but CEL won't go away.

Is the airflow sensor repairable ??? or should I buy a new one ???? Also, is it possible for some other fault to trigger a code 4 ???? Please help.

Thanks
smk_texas
98 s420
93 190e 2.4