CNT Headers- O2 sensor is short - Hyundai Genesis Forum
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post #1 of 5 Old 04-17-2017, 05:32 AM Thread Starter
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CNT Headers- O2 sensor is short

So I have done my due diligence and tried to research the fix.
Long story short.
I installed my CNT headers and long tubes, but the Driver Side Pre CAT O2 sensor is now to short to connect.
I disconnected the wire loom and tried to stretch it but no luck.
I could splice in longer wires on the O2 side, but I am concerned this will not be the best fix.
I searched for a pig tail adapter, but My 3.8 has 3 separate connectors for all of the O2 sensors.
The two post cat O2's are the same. And I don't want to order something that is not a 100% fix.

Any one else have to deal with this? Know a Part number that will do the trick?
Any help is appreciated.
Thanks.

2015 R-Spec, 6spd
R2C Intake
Lightweight Pulleys
BTR ECU (Secondary Cats Off)
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post #2 of 5 Old 04-17-2017, 07:39 AM
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My DNA Motoring headers were similar...driver's side was short. But, I managed to get it to reach without splicing in additional length. I did have to buy a new O2 sensor (stripped threads on my old "downstream" sensor) and I noticed that it had much longer wires. I bought a "universal" Bosch O2 sensor at Autozone for $60 and spliced the wires into the Hyundai connector from the old O2 sensor.

For my "downstream" cats, I had O2 bungs welded into the X-pipe just after the secondary cats, angled slightly down, and put the O2 sensors there. Works great, but you have to extend the wires to those ones about 4 feet. I bought a length of Home Depot stranded 16/4 (I believe) and just crimped the splices. Used the original plugs at the front, and ran the additional 4 feet all the way to the O2 sensor. In retrospect, I should have put a 2nd connector at the back by the O2 sensor, but I got lazy and just connected the wires directly.
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post #3 of 5 Old 04-17-2017, 08:24 AM Thread Starter
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Yeah, the only one I have an issue with is the Driver side Pre CAT. All others are excellent. I think I will splice in some wire like you did and just use crimps. No solder. Also, I have my Cat delete on my tune already so I am hoping not to get a CEL
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R2C Intake
Lightweight Pulleys
BTR ECU (Secondary Cats Off)
CPE Catback exhaust
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post #4 of 5 Old 04-20-2017, 05:34 PM
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Originally Posted by koreancoupe View Post
Yeah, the only one I have an issue with is the Driver side Pre CAT. All others are excellent. I think I will splice in some wire like you did and just use crimps. No solder. Also, I have my Cat delete on my tune already so I am hoping not to get a CEL
All you have to do is extend your existing wires .

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post #5 of 5 Old 04-24-2017, 04:14 AM Thread Starter
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Just an update, the O2 Sensor is Bosch 18044, I purchased one from EBAY for $22 and the pig tail is long enough. No splicing needed. Finishing up the catch cans today and should be started by late evening today.
I can not wait to hear the headers. Thank you everyone for your input.

2015 R-Spec, 6spd
R2C Intake
Lightweight Pulleys
BTR ECU (Secondary Cats Off)
CPE Catback exhaust
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