Subject	If they fail a code will show. If the heater section fails >
Posted by	ZUL8TR on March 26, 2013 at 2:05 PM
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In Reply To	When they fail do they still pass the self test in the FSM? (n/m) posted by SMAZ (OKC) on March 26, 2013 at 08:51 AM
Message	there will not be a code as far as I know. If you do the self test and get at least 5 CEL flashes in 10 sec at 2000 rpm when warmed up that supposedily means OK. However the voltage swings could not be as designed. The voltage should swing from about 0.1 - 0.9V. As the O2's age and get contaminated with deposits the voltage signal gets lazy and stays closer to 0.5v but could still give an OK with the CEL flash test. So if you check the voltage and it is in the range noted and the CEL test shows OK they might be OK, but still check the heater section for the correct Ohm range, if bad regardless of the voltage and CEL test being Ok replace the O2's. ZUL8TR in Orlando,FL
Follow Ups	How common is it for a O2 sensor to fail? (n/m) - 1badttz 17:18:51 03/25/13 They are a wear item, depends on exhaust temp, fuel used etc - ttsmokin 18:11:11 03/25/13 Not real common unless perhaps oil fouled or someone - jzack 18:19:30 03/25/13 Every 50-75k they should be replaced - Summeronthechain (MN) 22:02:39 03/25/13 When they fail do they still pass the self test in the FSM? (n/m) - SMAZ (OKC) 08:51:28 03/26/13 If they fail a code will show. If the heater section fails > - ZUL8TR 14:05:26 03/26/13 I'm getting a code 33 - 1badttz 11:03:39 03/26/13 When you say it goes away for a day or two.... - 300ZMang 08:23:24 03/28/13 Oh.... and it's not weird that it only does this when warm - 300ZMang 08:24:49 03/28/13
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