Code 21
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
DRB displays O2S STAYS AT CENTER. Condition is: no rich or lean signal detected from oxygen sensor input. DRB will display left or right O2S (if equipped).
DRB displays O2S SHORTED TO VOLTAGE. Condition is: oxygen sensor input voltage maintained at more than normal operating range. DRB will display left or right O2S (if equipped).