O2 Sensor problem after FI LTH install

scott982 · 12-04-2011, 07:42 PM

Yesterday I had Fast Intentions Long Tube Headers installed on my 2011 370Z. Everything went smoothly except for a CEL. The codes I am getting are p0051 (low voltage on the o2 heater) and p1168 (closed loop control function) on bank 2 sensor 1. The car is running really rough and I don't want to drive it until this issue is resolved. I don't see how the sensor could be bad, it unscrewed from the factory exhaust manifold very easily and the mechanic was very careful with it. It was never dropped or bumped into anything.

The mechanic warned me that extending the wires on the o2 sensor was a bad idea. Suggesting that I should extend the wires on the cars wiring harness instead. He said that the solder can screw up the resistance on the wires and cause all sorts of issues with AF readings. I told him to do exactly what the directions said and now I have this issue. My car only has 6,000 miles on it and everything was fine before the install. After some research I discovered that the 2011 370Z uses a different pre cat o2 sensor from the 09-10. I was thinking that could be the issue but the bank 1 sensor appears to be working fine. I have searched and was unable to find any members with the headers installed on a 2011.

After the light came on we pulled the sensor out and checked all the wiring and connectors. Everything looked fine. If anyone has any advice I would really appreciate it. I was going to call Tony in the morning, but I would really like to fix this tonight. It's cold, raining, and my only other way to work in the morning is my motorcycle.

F.I. Inc. · 12-05-2011, 12:16 AM

Quote:

Originally Posted by scott982

Yesterday I had Fast Intentions Long Tube Headers installed on my 2011 370Z. Everything went smoothly except for a CEL. The codes I am getting are p0051 (low voltage on the o2 heater) and p1168 (closed loop control function) on bank 2 sensor 1. The car is running really rough and I don't want to drive it until this issue is resolved. I don't see how the sensor could be bad, it unscrewed from the factory exhaust manifold very easily and the mechanic was very careful with it. It was never dropped or bumped into anything.

The mechanic warned me that extending the wires on the o2 sensor was a bad idea. Suggesting that I should extend the wires on the cars wiring harness instead. He said that the solder can screw up the resistance on the wires and cause all sorts of issues with AF readings. I told him to do exactly what the directions said and now I have this issue. My car only has 6,000 miles on it and everything was fine before the install. After some research I discovered that the 2011 370Z uses a different pre cat o2 sensor from the 09-10. I was thinking that could be the issue but the bank 1 sensor appears to be working fine. I have searched and was unable to find any members with the headers installed on a 2011.

After the light came on we pulled the sensor out and checked all the wiring and connectors. Everything looked fine. If anyone has any advice I would really appreciate it. I was going to call Tony in the morning, but I would really like to fix this tonight. It's cold, raining, and my only other way to work in the morning is my motorcycle.

I got your pm and replied to that for you.

We send out 8 high grade, high temp. color coded wires with the headers.

-4 Black
-2 Blue
-2 White

They are already cut specifically to length and the instructions state specifically to only lengthen (1) original wire at a time. This way there can be no mix ups or wire crossing. Now I am pretty sure that you bought the headers used so i do not know if you have everything you need with them.

I have over 90 sets installed between the 370Z and G37 coupe and this is the first time I have encountered this. From the 2 codes your car has thrown, I am almost certain the mechanic that lengthened them did something wrong. Even though the (sensor probe itself) on the 2011 is different, that will not effect the outcome. As long as the correct wires are soldered back together and the correct wire is used, you should not have any problems.

I will be in the shop @ 8 am PST. Give me a call whenever you like and I will help you the best that I can. I am sure it is something that can be corrected somewhat easily...

Thanks, Tony

Rooskey · 12-05-2011, 02:46 AM

No offense whatsover but I would be looking for a new mechanic to work on your ride. From the sounds of it I would look over my header bolts too.. Good luck and hope you get it running right.

MattP725 · 12-05-2011, 08:56 AM

I'd start with resetting the ECU but after that I would check the lengthened wires to make sure they are securely soldered and wrapped. Sounds like a simple signal issue. FYI you are always going to throw codes with LTHs. Get a tune to disable them if you don't want it (that is what I did).

F.I. Inc. · 12-05-2011, 11:28 AM

Quote:

Originally Posted by MattP725

I'd start with resetting the ECU but after that I would check the lengthened wires to make sure they are securely soldered and wrapped. Sounds like a simple signal issue. FYI you are always going to throw codes with LTHs. Get a tune to disable them if you don't want it (that is what I did).

This advice is not (entirely) correct. Good advice in the first part of what you wrote as far as inspecting the wires.

On the second part you are not correct. You should not throw any codes with our headers. When installed properly, there should be NO CEL light or codes.

Thanks, Tony

F.I. Inc. · 12-05-2011, 11:32 AM

Scott,

Thanks for the call this morning. I am sure once the wires are taken apart and then soldered back together you should be fine. Since it is an issue only on one side, I am quite certain it is just an installation issue.

Call me back if you need anymore advice.

Lastly, I look forward to getting your exhaust out to you so you can enjoy it with our headers...

Thanks,

scott982 · 12-05-2011, 08:03 PM

After another phone conversion with Tony I believe we have solved the problem. The mechanic used an impact to remove the demon bolts and the vibration destroyed 2 of my o2 sensors.

Quote:

Originally Posted by F.I. Inc.

Scott,

Thanks for the call this morning. I am sure once the wires are taken apart and then soldered back together you should be fine. Since it is an issue only on one side, I am quite certain it is just an installation issue.

Call me back if you need anymore advice.

Lastly, I look forward to getting your exhaust out to you so you can enjoy it with our headers...

Thanks,

Thank you so much for all the help today. I can't wait for the catback to get here.

F.I. Inc. · 12-05-2011, 09:56 PM

Quote:

Originally Posted by scott982

After another phone conversion with Tony I believe we have solved the problem. The mechanic used an impact to remove the demon bolts and the vibration destroyed 2 of my o2 sensors.

Thank you so much for all the help today. I can't wait for the catback to get here.

I will overnight those new wires out tomorrow. You live and you learn man. I had to learn the hard way a while back for the same thing. I ended up buying that customer a new sensor. As we all know, they are not cheap for this car!

Tony

KevinB · 01-22-2012, 10:28 AM

How do you test for a bad sensor? Will there always be a cel light?

F.I. Inc. · 01-22-2012, 11:12 AM

Quote:

Originally Posted by KevinB

How do you test for a bad sensor? Will there always be a cel light?

Most times more than not there will be a CEL light if you have a bad sensor.

SPOHN · 01-22-2012, 12:29 PM

To FI INC.

I'd like to say I like how you are showing passion and care towards your customers. Repped

F.I. Inc. · 01-22-2012, 03:18 PM

Quote:

Originally Posted by SPOHN

To FI INC.

I'd like to say I like how you are showing passion and care towards your customers. Repped

We appreciate the positive words! In my book this is the only way it should be!

Thanks, Tony

engmontano11 · 01-23-2012, 10:58 AM

Tony,

Do you offer HFCs installation at your facility? I would feel much better having somebody at your facility installed them

F.I. Inc. · 01-23-2012, 11:24 PM

Quote:

Originally Posted by engmontano11

Tony,

Do you offer HFCs installation at your facility? I would feel much better having somebody at your facility installed them

Call me!

Peppers · 02-09-2012, 10:27 AM

I appreciate the time you took to reach out to me over the phone and give me some much needed direction! I will keep you informed on the outcome of the tests. And that's for sure, you'd have written a novel! Haha!

Thanks, Troy

12-04-2011, 07:42 PM	#1 (permalink)
scott982 Base Member Join Date: Mar 2011 Location: Austin, Tx Posts: 41 Drives: 2011 Nissan 370z Rep Power: 14	O2 Sensor problem after FI LTH install Yesterday I had Fast Intentions Long Tube Headers installed on my 2011 370Z. Everything went smoothly except for a CEL. The codes I am getting are p0051 (low voltage on the o2 heater) and p1168 (closed loop control function) on bank 2 sensor 1. The car is running really rough and I don't want to drive it until this issue is resolved. I don't see how the sensor could be bad, it unscrewed from the factory exhaust manifold very easily and the mechanic was very careful with it. It was never dropped or bumped into anything. The mechanic warned me that extending the wires on the o2 sensor was a bad idea. Suggesting that I should extend the wires on the cars wiring harness instead. He said that the solder can screw up the resistance on the wires and cause all sorts of issues with AF readings. I told him to do exactly what the directions said and now I have this issue. My car only has 6,000 miles on it and everything was fine before the install. After some research I discovered that the 2011 370Z uses a different pre cat o2 sensor from the 09-10. I was thinking that could be the issue but the bank 1 sensor appears to be working fine. I have searched and was unable to find any members with the headers installed on a 2011. After the light came on we pulled the sensor out and checked all the wiring and connectors. Everything looked fine. If anyone has any advice I would really appreciate it. I was going to call Tony in the morning, but I would really like to fix this tonight. It's cold, raining, and my only other way to work in the morning is my motorcycle. Last edited by scott982; 12-04-2011 at 07:47 PM.

12-05-2011, 11:32 AM	#6 (permalink)
F.I. Inc. The370Z.com Sponsor Join Date: Feb 2009 Location: Simi Valley, CA Posts: 2,989 Drives: 2010 GT-R/2007 F-250 Rep Power: 686	Scott, Thanks for the call this morning. I am sure once the wires are taken apart and then soldered back together you should be fine. Since it is an issue only on one side, I am quite certain it is just an installation issue. Call me back if you need anymore advice. Lastly, I look forward to getting your exhaust out to you so you can enjoy it with our headers... Thanks, __________________ *Follow us on Facebook: Fast Intentions Inc.* Phone: (805) 522-FAST (3278) Email: tony@fastintentions.com www.fastintentions.com "FUELED BY PASSION"

01-22-2012, 10:28 AM	#9 (permalink)
KevinB Base Member Join Date: Sep 2011 Location: Louisiana Age: 53 Posts: 75 Drives: 09 370z blk m6 Rep Power: 14	How do you test for a bad sensor? Will there always be a cel light? __________________ 09 6MT MB: Int/Ext LEDs, Stillen G3 + FI test pipes + FI cat back + Stillen sways + Clutch Helper Spring

01-22-2012, 12:29 PM	#11 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 222	To FI INC. I'd like to say I like how you are showing passion and care towards your customers. Repped Felix 808 and DEpointfive0 like this. __________________

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12-05-2011, 02:46 AM	#3 (permalink)
Rooskey Track Member Join Date: Jul 2010 Location: South Carolina Posts: 974 Drives: 2014 Alpha7 GTR Rep Power: 16	No offense whatsover but I would be looking for a new mechanic to work on your ride. From the sounds of it I would look over my header bolts too.. Good luck and hope you get it running right.

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MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 17	I'd start with resetting the ECU but after that I would check the lengthened wires to make sure they are securely soldered and wrapped. Sounds like a simple signal issue. FYI you are always going to throw codes with LTHs. Get a tune to disable them if you don't want it (that is what I did).

01-23-2012, 10:58 AM	#13 (permalink)
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02-09-2012, 10:27 AM	#15 (permalink)
Peppers Base Member Join Date: Mar 2011 Location: Texas Posts: 94 Drives: 2009,370Z, Blue,6pd Rep Power: 14	I appreciate the time you took to reach out to me over the phone and give me some much needed direction! I will keep you informed on the outcome of the tests. And that's for sure, you'd have written a novel! Haha! Thanks, Troy