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Old 04-07-2014, 04:17 PM   #1
Btime
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Need O2 Sensor help!

Just bought an 03 ZX5 SVT. The previous owner ran it over a curb or median or something. The headers needed to be replaced so I got a set that I understood to be stock for a first gen svt. However it does not have a place for an O2 sensor. I looked at the original headers, and it looked like someone had added one themselves (really haggard weld) and also the wires for the plug were just spliced into a different harness.

My question is what did it come with from the factory? Why were neither of these headers set up for an O2 sensor?

Before I replaced it, I unplugged that sensor while running and there was no change or check engine light. After installing the new headers, it runs much better but there is a check engine light. Do I need to drill my own hole or am I missing something?

Thanks in advance!!


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Old 04-07-2014, 05:38 PM   #2
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The factory header for the SVT does not have an o2 bung, thats actually located on the cat right behind where the header and cat come together. The factory o2 on the cat is on top of the cat in a pita location to get to, hence why most replacement cats and orps have it reloacted to the side for easier access. As to the cel from replacing the header do you have the o2 sensor plugged into the whole on top of your cat, or is that all been replaced and there no longer is a place to screw it in? You also said that the harness looked all hacked up can you het a pic of that to see what they did?
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Old 04-07-2014, 08:00 PM   #3
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Awesome thanks, that cleared up a lot. There's a plug in the forward sensor position. Not sure why it was not used and tacked in place, but I think I'm going to add an off-road pipe instead of this cat. Its also kinda busted up and welded.

Upon second look, the wires didn't look too bad. I should be able to plug right into a cat-omission pipe.

Thanks again!

** my phone won't upload the pictures right now.
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Old 04-07-2014, 08:50 PM   #4
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All good on the pictures, they may have spliced in a universal sensor, so a new ford o2 should plug right into the factory harness. If you do go orp make sure you buy the o2 eliminator, make one, or get a tune to turn off your cel.
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Old 04-09-2014, 10:11 PM   #5
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Cool, I'm looking at an o2 cheater right now on cfm where I saw the pipe. If the sensor was just plugged right into the rear bung of the orp it would still throw a code right, yeah?
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Old 04-09-2014, 11:16 PM   #6
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Yes, without a cheater or a tune it will throw a p0420 cat code, since it'll think the cat is useless. Which it is with an orp :) So either grab the cheater if you don't want to build one, or look here for instructions to do it for a couple bucks instead of $40

http://www.focusfanatics.com/forum/showthread.php?t=130381

Or you can also get a tune, which not only improves the feel of the car tenfold, but you can have the rear sensor turned off in the pcm then just plug the rear hole in the orp.
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Old 04-09-2014, 11:47 PM   #7
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That's perfect thanks! I'll probably be looking for a tune in the future, but for the meantime I'll definitely make my own.
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Old 04-09-2014, 11:52 PM   #8
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When that time comes though, would you recommend taking it in to have it tuned, or buying one of the pre-loaded programmers?
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Old 04-10-2014, 12:23 AM   #9
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I would say get a hold of Tom on here, username 1turbofocus, he will send a tuner that you hook up to the car, and as long as you stay n/a he'll provide free updates to your tune for anything that you add after your first tune. Inhave his tune and love it, it really does make a difference on how the car feels driving it.
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Old 04-10-2014, 02:04 PM   #10
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Awesome, I'll contact him and see what I can put together. I believe you about the performance, just seeing what I can budget for now. Thanks for all the info!
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