Does my 2002 gmc sierra 1500 have 2 catalatic converters? my repair manual states that it has 4 oxygen sensors,2 before and 2 after, but only shows 2 locations.

SOURCE: need to know where sensor 1 (oxygen sensor) on bank 1 is located

It would be on the left header pipe as you sit in the truck. Its the sensor in front of the cat

SOURCE: the rear oxygen sensor found on the catalatic converter

I'm not sure what type car you have, but I'm replacing the rear O2 sensor in my 2004 Honda Accord and it leads to a connector under the passenger seat. In my case, I had to push the passenger seat all the way forward and pull back the carpet a bit (luckily, it was pre-cut so it wasn't too bad). If you pull out the grommet underneath (where the wire feeds through). you'll see daylight when you pull the carpet back.
Good luck!

Andy

SOURCE: i have a 2002 gmc sierra 1500, need to change the

There are several located within the exhaust system(PIPE)You need to know witch one.

SOURCE: Where is the ambient temp sensor located on a 2002

Look in the grill area.It is easy to remove the grill Think there are 2- 10mm then the little plastic button fasteners.You try and pop up the centers with a little flathed.Once you have the top plastic off the grill will just pull out of the mounts.Pull at the mounting points.

2strokeJim

• 577 Answers
• Posted on Feb 07, 2012

SOURCE: location of oxygen sensor bank 2 sensor 2 for gmc sierra 1500 v8

Bank 2 is the bank that is farther back than the other when looking at eng from the front you will see that one cyl head is farther forward (closer to radiator than the other. this is #1 Bank) #2 is the opposite and sensor #2 is the one after the Catyliac Convertor towards the muffler. #1 sensor is between head and Cat.