quick question about O2's...
quick question about O2's... i just scanned my car and I had 2 left bank 1 lean codes.. Also a low voltage O2 sensor code...This also happens to be the same O2 my a/f gauge is hooked to.. (It isnt working any more It want read any bars) I replaced it with one off the rear i had b/c of 02 sims.... still gives the same code... My qustion is how can I fix this? i allready check the engine sensor fuse its good... 
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
check to make sure the wires aren't melted?
Clear PCM, install new O2 ... drive car around and see if the O2 is still reading lean and setting a code
If so then It's most likely wiring somewhere..
Check where you tapped the wire for your A/F gauge... this may have gotten corroded or come apart
There's an extension on bank one that goes up towards the top of the car
(so it's O2 sensor plugs into extension (comes w/car) plugs into another harness) disconnect this and ohm test it to make sure it's not dead
But my guess would be a problem where you tapped into the O2 sensor for your A/F gauge
Clear PCM, install new O2 ... drive car around and see if the O2 is still reading lean and setting a code
If so then It's most likely wiring somewhere..
Check where you tapped the wire for your A/F gauge... this may have gotten corroded or come apart
There's an extension on bank one that goes up towards the top of the car
(so it's O2 sensor plugs into extension (comes w/car) plugs into another harness) disconnect this and ohm test it to make sure it's not dead
But my guess would be a problem where you tapped into the O2 sensor for your A/F gauge
Its fine where I tapped into the O2 sensor.... I have checked the plug with an ohm meter... Its not dead... I havent checked the wires being melted... I almost bought a new 02 sensor but I didnt b/c I didnt know if the 02 was bad or not....
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
hmmm... maybe try swapping both front O2s and see if hte problem follows the sensor?
If it doesn't and you're confident w/the wiring ... then it would be a fueling issue I think?
Maybe a clogged injector on that side of the engine?
If it doesn't and you're confident w/the wiring ... then it would be a fueling issue I think?
Maybe a clogged injector on that side of the engine?
Ill double check the wiring but I pretty sure its ok... Ive tried swapping 02's around and still the same problem... The a/f gauge will work sometimes @ WOT but it want read past lean.... I pulled the plugs and all the ones on the left bank are a whitesh color so I know its running lean, that could be whats worng with my gauge.... What should I try first?
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Originally Posted by 99PewterZ28
Ill double check the wiring but I pretty sure its ok... Ive tried swapping 02's around and still the same problem... The a/f gauge will work sometimes @ WOT but it want read past lean.... I pulled the plugs and all the ones on the left bank are a whitesh color so I know its running lean, that could be whats worng with my gauge.... What should I try first?
There are some places that will do an injector cleaning ... or run some techron injector cleaner through a tank....
but if it's runnig that lean i'd be worried about driving it long
Was anything changed before this started happening?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo I dont have an autotap... I was using and OBDII scanner..... It just started out of the blue I was driving then all of a sudden it started missfiring, then the gauge quit working, and it started throwing the lean codes & low voltage on 02 left bank 1...
Ok I put all brand new plugs in.... Changed the 02 sensor(not a new one just replaced with one of the rears I had @ my house), Cleaned the mass air sensor, checked all the wires all the way to the pcm from the 02 sensor... Checked all plug wires... & my gauge still want work & its still surging & misfiring & running lean on the left bank....... SOMEONE PLEASE HELP!!!!!!!!!!!!!!
Originally Posted by 99PewterZ28
i just scanned my car and I had 2 left bank 1 lean codes.. Also a low voltage O2 sensor code...This also happens to be the same O2 my a/f gauge is hooked to..