O2 Sensor problem after FI LTH install

Gawl128

Really interested to see if this was resolved.

JC671

Peppers,

First of all congrats on the headers and welcome to the FI family.

I too had issues but not because of the headers but only because of installer ignornace.

I kept throwing a misfire code and a cataletic code which in return meant the 02 sensors.

Many cleared codes later and lots of trouble shooting. Come to find out. The damn shop put the 02 sensors in the wrong place. The primary was put inside of the J bend and the post cat was put inside of the header where the primary should of went.

BTW check your MAFs also on the intakes. Mine were dirty.

Hope this helps and FYI Tony has the best customer service hands down

Sh0velMan

To me, this was a pretty cut and dry mis-wiring of the O2 sensors.

I goofed up mine the first time (to my dismay, since they aren't cheap).

I would bet that this was resolved by correcting the wiring and replacing the sensors.

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F.I. Inc.

After our conversation, this was solved an I never heard of another issue from Peppers. Our last conversation was almost a year ago.

Thanks, Tony

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AlexRaymond19

Wow, +1 for great customer service! I just joined the FI family last night when my exhaust came in (bought it used from skorch)

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F.I. Inc.

Congrats! We are glad that you have our exhaust one way or another. If you have any questions regarding the exhaust please do not hesitate to ask.

Thank you, Tony

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Phone: (805) 522-FAST (3278)
Email: tony@fastintentions.com
www.fastintentions.com
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BHR-370z

Hello Everyone,

I have recently bought a long-tube headers (used) for my 370z which was perfectly installed but I came a cross the O2 sensors issue. The original wires are very short and I need to extend the wires.

Does anyone knows where can I buy longer wires? or extension cable/wire?

I need to buy them online for international shipment.

Kind regards.

F.I. Inc.

You need to contact us directly to order them. They are pre cut to length. We can supply you with just them or the entire header installation kit. The best way to contact us to place the order is directly thorough my email below.

Thank you, Tony

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Phone: (805) 522-FAST (3278)
Email: tony@fastintentions.com
www.fastintentions.com
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fork

Sorry to resurrect an old thread but I have similar problems.

Just installed the LTH's two weekends ago. Initially there was no CEL and I drove the car about 40 miles without issue. Then the CEL came on and stayed on and would not stay cleared. Eventually, 40 more miles later, the car started idling rough and would die after a couple seconds on start up. I had it get it towed to the shop. Our initial feeling is that the O2 sensors were wired wrong and that I had crossed the two black wires on one/both of the O2 sensors. Not knowing which sensor was the mistake, two new O2 sensors were purchased and very carefully the wires were spliced one by one (new wire was used for the splice. We did not reuse the wire provided by FI).

However, the car is still throwing codes P0053, P0300, and P2096 on the passenger side O2 sensor. Also, the passenger air/fuel sensor is reading 5v when it should be low to mid 2v. Could it be possible that crossing the black wires on the O2 sensor would have caused a short in the ECU such that the 5v source signal is not even reaching the O2 sensor anymore but is shorted in the ECU?

So, any suggestions? We have been told to reinstall the FI supplied splice wires back into the O2 sensors and will give it a try tomorrow. We rewired the new O2 sensors with new wire so we think it is strange that this cause the problem since only the passenger side is throwing codes and not the driver side as well.

fork

Just to come full circle with my problems in case anyone else screws up like me:

The black wires were crossed on the passenger O2 sensor that needed extended. This caused one of the pins in the PCM to burn out. Essentially, one black wire has 12V on it and the other has 5V. When the wires were switched, the 12V signal was to the 5V pin which caused the problem and burned out the pin in the PMC. This also explains why the other A/F sensors was reading a steady 5V on the scan tool.

The car ran for about 100 miles as the computer "adjusted" itself and eventually adjusted itself into car suicide. The only way to get it to run with the bad pin was to unplug the O2 sensors and run the car in a closed loop. I bought two new O2 sensors, a new PMC, and needed a flash from the dealer on the new PMC. The repairs cost more than the actual headers because 5 cents worth of wires were crossed. Moral of the story: take your time and read the damn instructions!

But oh my does the car sound excellent! Great quality product by FI!