Error codes 12 & 21

When I do the 3 time key turn thing.. I get these 2 codes. One is power
loss (I'm paraphrasing) like when you disconnect the battery. But My clock,
etc have no memory loss. The second code, 21 is for a bad O2 sensor which I
change about 6 months ago.

Is it bad wiring maybe? What should I check for?

Posted a while ago but rec'd no response. Please help.

thanks in advance for any info which can help,

--
Mel

97 Cherokee

I would pull the battery cable off for 15 minutes or so to reset the
codes and see what happens.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

"Mel P." wrote:
>
> When I do the 3 time key turn thing.. I get these 2 codes. One is power
> loss (I'm paraphrasing) like when you disconnect the battery. But My clock,
> etc have no memory loss. The second code, 21 is for a bad O2 sensor which I
> change about 6 months ago.
>
> Is it bad wiring maybe? What should I check for?
>
> Posted a while ago but rec'd no response. Please help.
>
> thanks in advance for any info which can help,
>
> --
> Mel
>
> 97 Cherokee

can this test be done on a '02 Laredo and how do you do it?

"Mike Romain" > wrote in message
...
>I would pull the battery cable off for 15 minutes or so to reset the
> codes and see what happens.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "Mel P." wrote:
>>
>> When I do the 3 time key turn thing.. I get these 2 codes. One is
>> power
>> loss (I'm paraphrasing) like when you disconnect the battery. But My
>> clock,
>> etc have no memory loss. The second code, 21 is for a bad O2 sensor
>> which I
>> change about 6 months ago.
>>
>> Is it bad wiring maybe? What should I check for?
>>
>> Posted a while ago but rec'd no response. Please help.
>>
>> thanks in advance for any info which can help,
>>
>> --
>> Mel
>>
>> 97 Cherokee

Turn the ignition key until the digital odometer displays, repeat
three times in succession and then back to "On" (On/Off, On/Off, On/Off,
On). At the fourth "On" the odometer will be replaced with codes. If no
codes are present then "Done" will appear.
http://www.wjjeeps.com/faultcodes.htm
God Bless America, ßill O|||||||O
http://www.billhughes.com/

JoE' wrote:
>
> can this test be done on a '02 Laredo and how do you do it?