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Removing O2 sensor J extension bung on FI LTH

so i went to a tuner because my car have this code p0300 for a while now and recently the car is running really bad and misfiring a lot. This

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Old 02-09-2017, 10:43 PM   #1 (permalink)
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Default Removing O2 sensor J extension bung on FI LTH

so i went to a tuner because my car have this code p0300 for a while now and recently the car is running really bad and misfiring a lot. This p0300 code started when we installed the FI LTH and so i went to the tuner because this is what they recommend to me and now the tuner still cant fix the issue and told me i need to get rid/remove the extension bung or J bung that comes with the headers and have the o2 sensor bolted directly to the pipe. Is this going to be a fix to my car or not?
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Old 02-10-2017, 12:14 AM   #2 (permalink)
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Isn't there 2 bung locations?

Sensor 1, direct exhaust flow. (This is what the ECU uses for adjustments)
Sensor 2, extension bung to defeat CEL.

If your tuner doesn't know this, get a different tuner.
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Old 02-10-2017, 06:28 AM   #3 (permalink)
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Get another tuner. Seems they are not very good. I see you are in California. I would Sebastian at Specialty Z to tune it.
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Old 02-10-2017, 07:11 AM   #4 (permalink)
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I've only ever heard positive things about Seb at Specialty Z
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Old 02-10-2017, 08:04 AM   #5 (permalink)
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the thing is i already paid him $650 i will go back there today and have him look at it again and if he cant still fix it hopefully he can still give me back my money.
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Old 02-10-2017, 08:05 AM   #6 (permalink)
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You're risking damage to your precious Z every time you let that tuner touch it. Request a refund (good luck) or just cut your losses and move on would be my recommendation.
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Old 02-10-2017, 08:08 AM   #7 (permalink)
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cut your losses and move on
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Old 02-10-2017, 06:33 PM   #8 (permalink)
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Ok so it turns out to be a bad front O2 sensor and now i need a new one. I dont know which one to buy the upstream or downstream o2 sensor? And what brand is a good one with a good price and where to buy them? Thanks in advance
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Old 02-10-2017, 07:32 PM   #9 (permalink)
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Ok so it turns out to be a bad front O2 sensor and now i need a new one. I dont know which one to buy the upstream or downstream o2 sensor? And what brand is a good one with a good price and where to buy them? Thanks in advance
Up=stream is the front...usually the rear one's tuned with.
They can be damaged if you used impact wrenches to remove bolts,etc..when removing/installing lth's
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Old 02-10-2017, 07:33 PM   #10 (permalink)
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Also,i thought a po300 was random cylinder mis-fire?
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Old 02-10-2017, 07:35 PM   #11 (permalink)
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Bosch is pretty durable...but other people make them/a bit pricey for the up-stream(front) one's.....usually the rear's are turned off during a tune-to prevent a cel
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Old 02-10-2017, 07:40 PM   #12 (permalink)
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Upstream is in the header & not the J pipe bung


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Old 02-10-2017, 07:54 PM   #13 (permalink)
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What do you think about the brand NTK or Denso?
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Old 02-10-2017, 08:01 PM   #14 (permalink)
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What do you think about the brand NTK or Denso?
either should be fine...Denso may be oem/ like spark plugs,
NTK is NGK's brand...haven't had to replace any yet @ 77,500mi.
just don't us impact wrenches on exhaust & be sure exterior of sensor's are clean...around wiring.
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Old 02-10-2017, 08:05 PM   #15 (permalink)
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Which sensor is bank 2?
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