P0134 O2 Sensor issue

beaverplt

Buick Newbie
9
0
1
Sussex, Wi
Buick Ownership
2005 Lacrosse
Hi all, My CEL went on a few days ago due to a P0134 Code indicating no reading on the front O2 sensor. Assuming that the sensor was the problem, I replaced it. I still have the code. The next thing to check is the wiring and the fuse. None of the wires are frayed or disconnected and the fuse is not blown. What else could it be?
 

Alan 55

Buick Newbie
166
62
28
Florida
Buick Ownership
2001 Buick Park Avenue, previously owned 1997 Park Avenue
Perhaps you have done this but my next step would be to clear the code and see if it returns.
 

Alan 55

Buick Newbie
166
62
28
Florida
Buick Ownership
2001 Buick Park Avenue, previously owned 1997 Park Avenue
Do you have a scan tool that will allow you to receive feedback from the Oxygen sensor? If so you could check to see what data the sensor is providing, if any. This could be helpful in the troubleshooting process. There is always the possibility that the oxygen sensor that you
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beaverplt

Buick Newbie
9
0
1
Sussex, Wi
Buick Ownership
2005 Lacrosse
Hi again, I have the OBD fusion code reader with wifi going to my phone. I just connected to the car and have 4 codes now. P0030, P0053, P0128, and P0135. All seem to have some connection to the bank one O2 sensor with the exception of P0128. The O2 sensor seems to be providing no data at all. I'm thinking that should indicate a wiring problem somewhere. I've looked at the visible wiring and it looks fine all the way up to where it disappears into a wiring loom.
 

2007LucerneCXL

Full Member
2,406
725
113
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Start with checking the P0030 code first as it may be tripping the following codes. Here's a link on how to check for it.

https://www.obd-codes.com/p0030

P0128 is more than likely unrelated, but fix P0030 first, then once that's cleared move on to P0128. Staying focus on one problem at time will eliminate addtional guess work later.
 

beaverplt

Buick Newbie
9
0
1
Sussex, Wi
Buick Ownership
2005 Lacrosse
I just took another drive with the data reader connected. The upstream O2 sensor's readings were all over the place. Anywhere from 0 up to 80, then down to 6, then up to 70, …… you get the picture. The downstream O2 sensor was steady in a range between 60 and 70. Any ideas on what else to check?
 

2007LucerneCXL

Full Member
2,406
725
113
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Bad O2 sensor on the replacement? There's some post on getting a new O2 sensor that was defective, cheap replacement ones seem to be hit and miss, guessing on the cause.
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beaverplt

Buick Newbie
9
0
1
Sussex, Wi
Buick Ownership
2005 Lacrosse
I've been reading that engine temp has a lot to do with O2 sensor function. That makes me wonder if P0128 code has something to do with the other codes? If I do need to replace the thermostat, what temp rating is the standard? I see 180 degree and 195 degree versions on various sites.
 
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Alan 55

Buick Newbie
166
62
28
Florida
Buick Ownership
2001 Buick Park Avenue, previously owned 1997 Park Avenue
195 would be my choice even in Florida. In colder area’s even more so for better heater functions.
 
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