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| E36 General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328. |
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01-07-2008, 10:18 AM
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98 328I spitting up a code
ok I have a p0420 Catalyst System Efficiency Below Threshold (Bank 1) code problem. so heres what I do know. 98 328I 138k miles auto enginuity code reader p0420 is the only code I get. car runs perfect. what voltage should the post o2 sensor be at ? and what should the output wave form be? looks like the front o2 and the aft o2 are reading about the same. I dont want to just start replacing parts until its fixed, I want to diagnose the problem and fix it the right way. I know that water in the exhaust can kill the o2 sensor and it has been real wet around here. so I need know to know what voltage ranges I'm looking for and what the wave form should look like.. maybe someone with a good post cat o2 sensor can get a screen capture of the proper wave form and voltage, please... thanks Last edited by Thew; 01-07-2008 at 05:44 PM.. Reason: added |
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