Ls1Gummi

iTrader: (2)

Looking for some good set of o2 sensors. Anybody recommend a certain brand??

LS6427

iTrader: (2)

A/C Delco, dealership. Or you could try Bosch at Advance Auto, but they sucked when I tried them.

9000th01ss

iTrader: (10)

I had bosch for 1200 miles before going out, I checked with HPTuners---dead.
Right now I have Denso O2's. Stock F Body application with headers.

Ls1Gummi

iTrader: (2)

Well did ya'll reset the computer after putting in the new o2s?? Buddy of mine said he went with Bosch and never had a problem with them.

Bad Lt1 Camaro

With my new headders i stuck with the stock A/C Delco o2's. Never had ne problems and IMO are much better than bosch

9000th01ss

iTrader: (10)

Reset the computer? Well I cleared the code with hptuners and actually LOOKED AT the O2 sensor output. The bosch sensors slowly went to **** (and I got f'ed on the warranty because advance said I already returned them)

Ls1Gummi

iTrader: (2)

Well what i meant was clear the codes first, unhook the battery then drive the car.

Yea well i think these have never been changed also. The guy that had the car before me put headers on the car and re-used the o2s.

9000th01ss

iTrader: (10)

Yea, Why do you think I'd have $1500 worth of tuning equipment hooked up to it and NOT clear the codes?
I never unhook my battery, it's done through the tuning software.

Heres the process to avoid further confusion.
I got an idea, I'll change my O2's they're a bit old.
Connect HP Tuners, scan, they seem to be working OK but bosch claims better mpg and the originals are old.
Swap to new Bosch O2's, connect HPT, scan, O2's are switching great.
DONE.
Several weeks later the car seems down on power, etc.
Got an SES code.
Connect HPT and scan, O2's are switching slow.
Read here on forum, they might switch slow with LT headers, answer, TUNE OUT the codes to prevent continous OL operation.
Erase DTC.
Car gets worse.
Connect HPT, scan, O2's are "flat lining" (that means they're dead.)
Research online, looking for a recommended O2 for LS1's and even other vehicles.
Buy Denso O2's, install them, connect HPT, scan for old DTC's, look at the new O2 switching pattern. Looks good.

So I'm pretty sure I got the O2 diagnosis and replacement worked out.


FWIW for mind blowing inside secret info, the GM O2's I was using came from random junkyard cars, I just spliced the plug end off my original O2's onto these with wire nuts, WIRE NUTS! Scanned them and even those mystery mileage/application O2's switched better than the Bosch pieces of **** after a few hundred miles.

2002_Z28_Six_Speed

iTrader: (19)

Best not to even run them.

LS6427

iTrader: (2)

Not necassary.

I bought Bosch 02's to try to save some money, put them in, they literally sucked right off the bat.

MY car was at Mecedo Motorsports in Orlando, I got in my car and drove to the dealership and bought new A/C Delcos, brought them back and they put them in, engine ran like new again.

Nothing has to be done to the PCM. At least not my PCM. And all PCM's DO NOT act the same. Just like when my IAC, Crank Shaft Position Sensor, Throttle Sensor and MAF failed, all at different times of course.....I get absolutely NO SES light. Only way to figure out whats wrong with my engine/car is to plug it up to an OBDII scanner. That tells all. My SES light has come on from time to time however, but ntohing was ever wrong, it always went out by itself after a couple days.

Bosch 02's have less vents on the sensor tips than the A/C Delcos, that might have something to do with it. All I know is, Bosch 02's actually do not work on my engine.

XxApollynxX

iTrader: (2)

I've never had a problem with the Bosch 02 Sensors, but heard alot of people had, either way cant go wrong with Denso or factory 02's.

SparkyJJO

iTrader: (11)

Are your stock sensors bad or are you replacing them just because?

Curious, should the pre-cat O2 sensors be replaced after a while even if they aren't throwing codes? My car is a 98 with 118K miles, no codes but wasn't sure if they were a wear item or not. The exhaust smells a bit rich to me but then I don't know if it is normal or not.

hutch1999

as long as its running properly and not throwing codes I wouldnt worry about them

jrpimp00

iTrader: (17)

Factory says to change o2's at 100k miles. I went with the bosch when I did my headers, I only put about 500 miles on it and no problems, yet.

2002_Z28_Six_Speed

iTrader: (19)

To be honest it is hard to sense AFR from exhaust smell.

Plugs would be a better indication.

the_merv

iTrader: (88)

I had one go out on my Engine and it ran like ****..when I get it running again I'm going to try the AC Delco ones. What's the going price on them?

rich Z

Don't use Bosch they suck. AcDelco I find work the best. Denso's are alright.

Ls1Gummi

iTrader: (2)

My car was sputtering bucking missing and kicking just trying to drive normal. I took the 02s out and cleaned them and it drives normal except now it does a little when i stomp on it.