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" <romainm (AT) sympatico (DOT) ca> wrote

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
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

JoE' wrote:

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