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Old 08-28-2010, 04:21 PM   #1
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svt cat rear o2 sensor problem

i just put a new engine in and i was getting everything put back together
I did the svt exhaust swap from header back.
as i was putting the rear o2 sensor in the svt cat it seems the sensor is hitting the drive axle(passenger side) not allowing me to screw it into the threads.
can anyone help me on this??


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Old 08-28-2010, 05:17 PM   #2
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i just took the drive axle out and screwed the o2 sensor in,put the drive axle back in and it is rubbing right on the o2 sensor.
are svt rear o2 sensors shorter that the upstream o2's???
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Old 08-28-2010, 05:25 PM   #3
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I had the same problem. The old owner had hit some thing and bet the lower part of the exhaust manifold. This is my temporary fix until CFM get there high flow cats back in stock. My plan is to get a high flow cat and relocate where the sensors are.

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Old 08-28-2010, 05:33 PM   #4
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everything is lined up the cat the engine bracket,the front o2 sensor??
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Old 09-16-2010, 05:09 AM   #5
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I had same problem, and I figured it out, when you bottom out or scrape like my stupid brother did, you crush the o2 sensor. This happened atleast 3 times, and one time all i did was pull up too far in a parking space and scraped/rubbed the bottom of the headers(they are so close to the ground) and bam, check engine light. again. I knew exactly what it was and how it happened as I had already figured it all out by this point. Had to go buy another $50 bosch o2 sensor. forget the $120 ford motorcraft ones. WAY too expensive. bosch ones work fine. and both the front and the rear should be same size/height. so you prolly have the same problem. look at the bottom of your headers right underneath your front bumper before they start to go to the back of the car, do you see evidence of scraping/rubbing? your headers got bent or pushed. get a new off road pipe or high flow cat or drill new holes on the side of the exhaust(how it should have been from the factory but ford is stupid) and relocate your o2 sensors or get spark plug antifoulers or wire them up in such a way that the computer thinks they are there and fine even tho they are not. there is a thread in the stickied must reads for new people. Its a shitty problem, i know. be careful when you park, and go slow on dips and such so you dont scrape or bottom out. hope i helped you :)
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