Unplugged Oxygen sensor - LS1TECH - Camaro and Firebird Forum Discussion

General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds

Unplugged Oxygen sensor

Thread Tools Search this Thread
Old 01-11-2018, 01:35 PM   #1
Registered User
Thread Starter
Join Date: Jan 2018
Posts: 1
Default Unplugged Oxygen sensor

I recently bought a 2006 Hummer H2 SUT.
The check engine light was showing oxygen sensor 2/ bank 2. I took it to my mechanic and he said it was unplugged. He fixed it and the light went off. 1 hour after driving it from the mechanic's the light came back on and was diagnosed as a random misfire. Could unplugging an Oxygen sensor bypass any other codes on the vehicle?
JORO9 is offline   Reply With Quote
Old 01-12-2018, 12:54 PM   #2
TECH Senior Member
iTrader: (36)
ss.slp.ls1's Avatar
Join Date: Jan 2008
Location: Orange County, CA
Posts: 7,607

I am not certain, but unplugging the o2's may force the vehicle to run in speed density mode.
ss.slp.ls1 is offline   Reply With Quote
Old 01-12-2018, 01:11 PM   #3
Save the manuals!
iTrader: (5)
wssix99's Avatar
Join Date: Dec 2007
Location: Chicago, IL
Posts: 10,195

^ Yes, it would.

So, the persons who unplugged the O2 sensor previously likely did that on purpose either to:
- Hide an emissions problem causing the misfire
- Address some sort of bad tune
wssix99 is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 09:45 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: