what does code P0136 mean

2001 HYUNDAI ELANTRA
197,000 MILES
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RIEBED
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Hi, I have a re-occurring code that keeps coming up when my mechanic scans the car (PO136)- any idea what this could be? Both O@ sensors have been replaced as well as the flex exhaust pipe-he also says that his scanner is reading 2 codes but the PO136 is the only code that is legible to be read. Also when I remove the gas cap or get gas the CEL comes on, is it possible that the PO136 code is a faulty code? Any help would be appreciated.
Dec 24, 2011 at 9:18 PM
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ASEMASTER6371
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if the voltage on the rear o2 is not between 400-500 millivolts, it will set the code. you need a better shop that can track this down for you. if you replaced it then the wiring or pcm may be at fault.

Roy
Dec 24, 2011 at 9:23 PM
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Thanks for the reply-he plans on looking more indepth-and he did sau that the voltage was good, we will just have to see what he comes up with
Dec 24, 2011 at 9:45 PM
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ASEMASTER6371
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good luck

Roy
Dec 24, 2011 at 10:17 PM