Where is the o2 sensor located on my 1999 Trans-Am

**ironspike** · 02-24-2009, 06:00 AM

New here so please take it easy on me.

I'm just trying to find out where my O2 sensor is on my 1999 Trans-Am.

Any help would be appreciated.

Thanks!

**98formy** · 02-24-2009, 06:10 AM

There are four total in the exhaust. The upsteam ones are before the converters, I think almost right in the manifold at the bottom. The downstream ones are after the converters, about 12" away I think. They look like a metal tube thing sticking out from the exhaust with a four wire connector.

**ironspike** · 02-24-2009, 06:15 AM

In the old days there was just one on my old chevy truck. :-)

On m 1999 TA my service engine soon light came on. Goodyear told me it was a o2 sensor. I throught there was only one.... seems I was wrong.

Now I have to figure out which one is causing me my issue.

Thanks for the help.

**2001NBMZ28** · 02-24-2009, 06:29 AM

Do you remember the code? That'll tell you which one it is, or if something else is going on.

**ironspike** · 02-24-2009, 06:59 AM

my little print out says:

02 Sensor/Code 2 P0442 Evap

The work order says the Rear one.

Would Autozone be able to tell me which one it is exaclty? Goodyear charged me 100 bucks and I was told Autozone does it for free.

Thanks!!! This fourm is great!

**slp1122** · 02-24-2009, 07:41 AM

Originally Posted by ironspike

In the old days there was just one on my old chevy truck. :-)

On m 1999 TA my service engine soon light came on. Goodyear told me it was a o2 sensor. I throught there was only one.... seems I was wrong.

Now I have to figure out which one is causing me my issue.

Thanks for the help.

ask them for the code, or to just tell you what sensor it is, they should know. the code reader will say what "bank" and sensor it is.

**0rion** · 02-24-2009, 02:17 PM

Originally Posted by ironspike

my little print out says:

02 Sensor/Code 2 P0442 Evap

The work order says the Rear one.

Would Autozone be able to tell me which one it is exaclty? Goodyear charged me 100 bucks and I was told Autozone does it for free.

Thanks!!! This fourm is great!

yep, autozone does it for free and if that's the code they gave you (0442) it's not O2 related. That's a small leak detected for the evap system.....clean the seal on or replace your gas cap.

**2001NBMZ28** · 02-24-2009, 03:50 PM

Which rear one? "02 sensor/Code 2 P0442 Evap" almost sounds like you had 2 separate codes? If the SES is still on I'd go to auto zone and have them read again for free, don't worry about the description, just post the code(s). Can't believe goodyear charged you that much just to scan for codes, I'd stay away from them.