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P0442/B2721/B2723 codes

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Old Apr 28, 2010 | 10:50 PM
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Default P0442/B2721/B2723 codes
The '"Check Engine" light came on on my 99 auto. I cleared the history codes but, I found three current codes. B2721 and B2723 are Pass Key detection circuit codes. What does this mean?
The car starts and run fine. I can't find P0442. P0441 says Evap System no flow during purge. Is P0442 similar. How do I correct these issues?
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Old Apr 29, 2010 | 09:47 AM
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Anyone?
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Old Apr 29, 2010 | 10:09 AM
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First thing I would check is to see if the gas cap is tight. Use the search function on the tech page and search the codes. You will find lots.
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Old Apr 29, 2010 | 06:48 PM
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Originally Posted by 87SAM
First thing I would check is to see if the gas cap is tight. Use the search function on the tech page and search the codes. You will find lots.
Well the gas cap is tight. It is the original one. Should they be replaced after 11 years?
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Old Apr 30, 2010 | 09:47 PM
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Ok, light is off after checking gas cap. How about the Pass Key codes?
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Old Apr 30, 2010 | 10:30 PM
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For starters, make sure the pellet on the key is clean.
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Old May 1, 2010 | 12:49 PM
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Originally Posted by 87SAM
For starters, make sure the pellet on the key is clean.
Ok, what can I use to clean the ignition cylinder itself? Do the pelllets wear out over time?
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