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Re: 1997 Grand Cherokee 4.0, new oxigen sensor and still code 21
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Originally Posted by pepo
I have a 1997 Grand Cherokee Laredo 4.0
The check engine code get the "code 21 oxigen sensor"
I've replace with an universal "the ones with 4 wires, 1 black, 1 purple and 2 whites and you have to solder the original plug on it" I've replaced and the code 21 still.
What I'm doing wrong??
Thanks in advance.
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HI TRY DISCONNECTING THE BATTERY GROUND CABLE FOR ABOUT 45 SEC. IF IT DOESN'T OFF REMOVE BATTERY POSITIVE CABLE FOR ABOUT 45 SECS. HOPE THIS HELPS DALE [email protected] 
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