Corvette C5 02 sensors
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7th Gear
Joined: Sep 2022
Posts: 7
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From: CA
Corvette C5 02 sensors
So my car has this issue when I bought it, at first the 02 sensors needed replacement, I changed the upstream and downstream sensors and the upstream sensors worked perfectly but I changed my downstream sensors to brand new ones but now it reads O2 sensor (bank 1, sensor 1) no activity, I thought my new sensors didn't work so I bought new ones again and it reads the same code again, I was wondering if maybe anyone else has a clue on what might've happened? I've been on this problem for a bit over a month now any help is appreciated! 
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Joined: Sep 2013
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From: Cape Coral, Florida
Welcome to the Forum !!…first can you fill out your profile as far as model year, mods, tune, etc so we can see what we are dealing with…I would recheck your connector there and make sure it’s seated properly…what brand O2 sensors are you using ??…my 2001 did not like Delphi and Bosch so I used Denso’s from Autozone and those worked perfectly…funny is that your bank 2 sensor seems to function fine so that may rule out a “brand” issue but now that I’m thinking of it my Delphi and Bosch worked OK on bank 2…do you have a scan tool to monitor your O2 sensors ??…without one it’s impossible to see what’s going on with the sensors…it’s a good investment !!..your sensor 1 are your upstreams which are forward of the cat.
Last edited by C5 Diag; Sep 21, 2022 at 07:39 AM.
Thread Starter
7th Gear
Joined: Sep 2022
Posts: 7
Likes: 0
From: CA
Welcome to the Forum !!…first can you fill out your profile as far as model year, mods, tune, etc so we can see what we are dealing with…I would recheck your connector there and make sure it’s seated properly…what brand O2 sensors are you using ??…my 2001 did not like Delphi and Bosch so I used Denso’s from Autozone and those worked perfectly…funny is that your bank 2 sensor seems to function fine so that may rule out a “brand” issue but now that I’m thinking of it my Delphi and Bosch worked OK on bank 2…do you have a scan tool to monitor your O2 sensors ??…without one it’s impossible to see what’s going on with the sensors…it’s a good investment !!..your sensor 1 are your upstreams which are forward of the cat.
