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Old 04-18-2012, 12:15 PM   #11
Gettysburg150
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I wish I could think of something for ya mate, but right now I can't think of anything helpful thats already been stated..
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Old 04-18-2012, 04:36 PM   #12
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I checked the #18 fuse and it looked fine :/
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Old 04-21-2012, 07:25 PM   #13
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**nvm

Last edited by kkeiran; 04-24-2012 at 05:19 PM.
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Old 04-24-2012, 05:36 PM   #14
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I just got my car back from a local mechanic. They said it was a bit difficult to locate, but they were able to find a problem in the harness. The sensors were fine, but the bad voltage due was triggering the codes for the 02 and Knock Sensor.

Basically mikebontoft hit the nail right on the head.

Thanks for the replies, everybody! Hopefully I can drive cycle a few days and get through inspection soon before any more issues arise! hehe
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Old 11-18-2012, 10:43 AM   #15
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New to SVT here, bought it the other day and now trying to get rid of the CEL to pass emissions. I'm thinking that I may have the same problem or something extremely similar. Had codes for o2 sensor bank 1, sensor 2 and knock sensor. replaced them both and the code came right back. If anyone has any insight on where I might look through the wiring harness to find the problem. I'm going to start just going through it, but any help would be greatly appreciated.
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Old 11-18-2012, 06:24 PM   #16
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Did you replace them with Motorcraft? SVT's are really picky.

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Old 11-18-2012, 07:18 PM   #17
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To anyone who has this problem more than once, I recomend tuning the car and in the process turning the post cat O2 off. This is what I did on mine and thus allowing me to run a test pipe without the O2 throwing a code.
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Old 11-18-2012, 10:11 PM   #18
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Thanks for a quick reply. After replacing them the o2 sensor with a bosch replacement, I took a real hard look at all the wiring connections today and located a plug that was disconnected. Now no codes and its running great.
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Old 11-20-2012, 11:14 PM   #19
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Also something I've ran into as-well check your vaccum lines and make sure none are broken.. also check the large one near the throttle body it's a black rubber hose make sure it's not slit. Mine was.. I know it's not O2 related but it's something I would still check.
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Old 04-25-2013, 09:26 AM   #20
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I'm getting a similar issue on my '02 SVTF - P0141 and P0136 codes come up, I checked the fuse, cleaned the connections and then replaced the 2nd (post-cat) O2 sensor with a Motorcraft one and the codes come back every time.

This is the first thread I've seen discussing wiring diagrams - can anyone link me to a wiring diagram or identify any trouble areas?
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