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Old 02-26-2012, 03:09 PM   #1
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Check Engine

Hi, I have a 94 Wrangler. It was at the workshop 3 months to be painted. Now the Check engine indicator is on. The codes were 12, 33, 52. It does not have AC, I have ch aa nged the Oxygen Sensor and the check engi.e indicator is sending the same codes. Now it is also qhite accelerated......Any idea of the problem and possible solution?

Thanks!!!!

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Old 02-26-2012, 07:00 PM   #2
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Have you cleared the codes since changing the sensor?

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Old 02-26-2012, 07:04 PM   #3
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Yes, disconnecting the battery. Today I bought a second sensor and it is not the problem....
Thanjs!!
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Old 02-27-2012, 07:55 PM   #4
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Check for a broken or damaged wire or connection
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Old 02-27-2012, 08:35 PM   #5
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Thanks I will check every connection. Hopefuly I can find a damaged hose or a bad connection.
Thanks!!!!!!
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Old 02-27-2012, 09:05 PM   #6
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52 is a rich condition. I would start with the simple stuff. air cleaner, tune up. then what o2 sensor are you buying? oe, or cheapest one at the parts store. sometimes that makes a difference. check wire resistance, look at plugs to see if fouled.
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Old 02-27-2012, 10:11 PM   #7
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i have the same problem 94 yj 2.5 liter codes 12, 33, 41.sat for 4 years did full tune up, airfilter, new o2 sensor. scanner is saying low voltage to sensor new sensor no help. also replaced fuel sending unit, is this tied in with the o2 sensor
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Old 02-27-2012, 10:29 PM   #8
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check engine

i have a 94 yj 2.5 liter eng.codes 12, 21, 33 sat for 4 years replaced fuel sending unit full tune up, airfilter, new o2 sensor. still have check eng and message saying low voltage too low. also failed emmisions high co and co2.
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Old 03-02-2012, 10:09 PM   #9
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I have bought the sensors in Autozone. One day after the second sensor was installed it was showing the codes, suddenly the problem was solved.....what happen????????
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Old 03-02-2012, 10:19 PM   #10
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When the check engine light is activated because of an out of spec reading, it will sometimes go off after a specified number of cycles in a row that are in spec. Example: my Dodge Ram will throw a code when the PCM detects poor battery condition while starting the engine. The light remains on unless there are six normal startups in a row, then it goes off. The codes may still be stored, though.

The second sensor may have been the problem.
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Old 03-04-2012, 08:21 PM   #11
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Sounds that this is what happened. Now it is running well!!! Thanks to all of you for your time and comments!! o|||||||o
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Old 03-05-2012, 04:07 PM   #12
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Quote:
Originally Posted by SandyMushYJ View Post
When the check engine light is activated because of an out of spec reading, it will sometimes go off after a specified number of cycles in a row that are in spec. Example: my Dodge Ram will throw a code when the PCM detects poor battery condition while starting the engine. The light remains on unless there are six normal startups in a row, then it goes off. The codes may still be stored, though.

The second sensor may have been the problem.
The ECM has to "learn" the new part also,

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/w steel half door and slider windows
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