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Cronic O2 sensor problems

Tiny
ERNIED111
  • MEMBER
  • 2012 CHEVROLET CAMARO
  • 6.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 38,000 MILES
I have the SS model. I have been getting o2 sensor error codes. Anywhere from eight to eighteen codes, upstream and downstream codes, Low voltage, Lean codes, rich codes. I would type all the different codes but, it would make little difference. Pretty much every code out there I keep getting. I have spent a small fortune having the dealership try and fix it. I have replaced the following items. Upstream/downstream sensors, banks 1 and 2. Mass air flow sensor, High performance GM spark plugs and wires. I have the codes reset. After a day or two or sometimes the same day, They just keep coming back. Bottom line, I have spent way too much money as a lab experiment at the GM dealership.
My car symptoms are horrible fuel economy, at slow speeds sputters before shifting. (I have an automatic transmission).
I am looking any help you can give me. I do not know where to take my car. Please, Help me!
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Tuesday, January 24th, 2017 AT 2:46 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If you have one of those nifty things that you plug into your aldl take it out and see if you have the same problem as these are known to cause problems in GM vehicles. Also, check battery for condition including load test most places do for free. Then check or have done for low voltage going to PCM as well as ground as that may set O2 codes. You might check fuse box for corrosion on PCM fuses then use dielectric grease for better contact after cleaning if you can. There is a TSB but it does not affect your vehicle, but it does others and yours may be falling into that trap. If you have wide range O2's that may also be the problem. Or one of the kits to raise horse power.
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Tuesday, January 24th, 2017 AT 3:58 PM
Tiny
ERNIED111
  • MEMBER
  • 5 POSTS
I do not have anything plugged in. I have stock o2 sensors. I will check voltage and have it load tested. What kit are you referring to?
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Tuesday, January 24th, 2017 AT 4:13 PM
Tiny
ERNIED111
  • MEMBER
  • 5 POSTS
I will keep you informed. Thank you.
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Tuesday, January 24th, 2017 AT 4:14 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I forget what they call them, like the bully dog things that modify the puter for more horse power.
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Tuesday, January 24th, 2017 AT 4:31 PM
Tiny
ERNIED111
  • MEMBER
  • 5 POSTS
I do not have anything like that. Do I just tell them to check voltage to PCM/ground and they will know what I mean?
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Tuesday, January 24th, 2017 AT 4:35 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Yes they should. Any garage can do this not only a dealer.
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Tuesday, January 24th, 2017 AT 4:41 PM
Tiny
ERNIED111
  • MEMBER
  • 5 POSTS
Kind of afraid of the dealer right now.
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Tuesday, January 24th, 2017 AT 4:55 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,576 POSTS
Really sounds like a voltage issue or a bad PCM. Take a real close look at the wiring harnesses around the back of the engine where they drop down near the exhaust. It's possible that they are damaged or shorting and causing a bunch of the codes.

Have them check the fuel trims and injector pulse width timing as well. You could have a couple of bad injectors that are sticking at times and causing the poor economy and if they stick open, dump fuel the PCM sees RICH and commands the system lean, Then the injectors work a bit and the system screams LEAN and starts dumping more fuel.
Oh and a test for you, pull the dip stick and look and small the oil, is it thin and smelling like gas? That could indicate the above problem as the gas washes past the rings.
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Wednesday, January 25th, 2017 AT 3:56 PM

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