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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Tests W/Codes - 2.2L) >> CODES/MESSAGES (Note: For DTC table, see TEST TC-1A under "Self-Diagnostic Tests.") >> Code 21

Code 21

WARNING: This page is about a different car, the 1994 Plymouth Sundance and 1994 Dodge Shadow. However, it is still accessible from the selected car via links, so may be relevant.

DRB displays O2S STAYS AT CENTER, LEFT O2S STAYS AT CENTER, or RIGHT O2S STAYS AT CENTER. Condition is: no rich or lean signal detected from oxygen sensor input.



DRB displays O2S SHORTED TO VOLTAGE, LEFT O2S SHORTED TO VOLTAGE, or RIGHT O2S SHORTED TO VOLTAGE. Condition is: oxygen sensor input voltage maintained at more than normal operating range.

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