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Old 05-04-2008, 07:20 PM   #1
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Join Date: Mar 2008
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Check engine light

so i was about 2 miles from home after an 80 mile trip and my check engine light goes on so i ran the codes and got

12- direct battery input to pcm was disconnected within the last 50 key on cycles?

33- An open or shorted condition detected in the AC clutch relay circuit .

24- Throttle position sensor input above maximum acceptable voltage
or
Throttle position sensor input below minimum acceptable voltage.

21- Neither rich nor lean condition detected from the oxygen sensor input
or
Oxygen sensor input voltage maintained above the normal operating range.

then the light went out the next day after not driving at all is it possible my
O2 sensor is jsut getting gummed up and causieng all of this. if anyone had any ideas on how to fix any of this or where i should start i would greatly appreciate it. BTW its a 95 2.5l yj and the A/C was takin out before i baught it.

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Old 05-17-2008, 06:24 AM   #2
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Location: Louisville, KY
Posts: 53
It is most likely your O2 sensor. Mine did the same thing about 2 weeks ago. It will go off for awhile everytime you restart. It will eventually come back on. If you do not have A/C you will always get the 33 code (mine does not have A/C as well). O2 sensor is a very easy replacement and I recommend Bosch sensors. It will also give better fuel economy after you replace the sensor assuming the computer will now be able to meter the mixture better. The throttle position sensor shold be replaced? I'd try the O2 first and see if the check engine light stays off permanently. Good Luck.

95 YJ 2.5L Automatic w/ 140+ K on the clock.
Preventative Maintenance is the Key.

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Old 05-17-2008, 08:47 AM   #3
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Based on the numerous "electrical" references in each one of the warning codes listed, "I" would have thought that there was some type of general "electrical" fault.

Follow "yjtodd's" lead....he probably knows better than I.

-soupy1957
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Old 05-27-2010, 09:41 PM   #4
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Quote:
Originally Posted by gmccomas412 View Post
so i was about 2 miles from home after an 80 mile trip and my check engine light goes on so i ran the codes and got

12- direct battery input to pcm was disconnected within the last 50 key on cycles?

33- An open or shorted condition detected in the AC clutch relay circuit .

24- Throttle position sensor input above maximum acceptable voltage
or
Throttle position sensor input below minimum acceptable voltage.

21- Neither rich nor lean condition detected from the oxygen sensor input
or
Oxygen sensor input voltage maintained above the normal operating range.

then the light went out the next day after not driving at all is it possible my
O2 sensor is jsut getting gummed up and causieng all of this. if anyone had any ideas on how to fix any of this or where i should start i would greatly appreciate it. BTW its a 95 2.5l yj and the A/C was takin out before i baught it.
So what did you find out ? I'm having similar problems
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Old 06-09-2010, 10:08 PM   #5
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Join Date: Jun 2010
Posts: 2
This sounds like what my jeep is doing. Mine has a bolt missing or broken off the exhaust manifold, will that cause a check engine light to come on?
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