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Old 10-22-2009, 01:39 PM   #1
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Error Codes ?

Hello.

A neighbour wanted to start his YJ 4.0L some minutes ago and then the check engine light went on.

The error codes were:

12
33
21

What does that mean?

After talking to me about that for a while we started teh YJ again and everything was ok again.

Does he have to worry about something?

Thanks.
nicolas-eric

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Old 10-22-2009, 02:01 PM   #2
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i have a 12 and 33 on mine Cant remember what they are. one is unhooked ac
the 12 i think is not important. navy chief has the codes if you ask him to post again, or search past posts for yj error codes.

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Old 10-22-2009, 02:21 PM   #3
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for sure for sure. if no A/C, ignore 33 and 12 is for tj's.
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Old 10-22-2009, 02:28 PM   #4
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And 21 is the o2 sensor or the circuit?
What should he check first?
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Old 10-22-2009, 02:32 PM   #5
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usually the sensor. let me check wiring so i can let you know what voltage is at the plug.
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Old 10-22-2009, 02:33 PM   #6
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ok thanks. where at the plug should he mesure the voltage?
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Old 10-22-2009, 02:40 PM   #7
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sensor has a 4 pin plug
pin1 to splice 114 to all other sensors
pin2 to pin 41 of pcm. power pin. probably 8-12 vdc
pin3 to ground
pin4 to fuel injectors

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IF YOU CAN'T EAT IT OR PLAY WITH IT,
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