yes, which one is bank 1 sensor 3? im throwing a heated o2 code, is that the sensor right before the cat, or right after the cat?...

In my honest opinion 4 sensors is way overboard, and i need to get this taken care of fairly quickly before it drives my eye sockets crazy.....

on the upside i can clear the code and it wont come back for in between a few months or a few days lol

 

post cat.

 

thank you for the clarification swartlkk.

before I started going with the "likely" guess I felt it to be a wise idea to hit the forums first, Im still used to the "one wire one sensor" setups...

since the sensor is post MAIN cat it really wont effect gas mileage much would it? I know it communicates with the ECU and the pre MAIN cat sensor for "optimum info", but from what i read its mainly used as a checker so the cat is in proper working order

 

In the 4 sensor setups, the last two sensors (post- & pre-cat) are emissions monitoring sensors only and do not have any affect on engine operation.

 

its a shame i cant just swap pipes because if i properly recall my 98 Bravada is damn near the same besides the post cat o2 bung being obsolete, its amazing how extreme id go to avoid spending 60bucks on a o2 sensor lol

 

where can I purchase O2 sensor for Blazer 2000 LT 4X4.

 

autozone, advance auto parts, murrays... any autoparts store honestly....

or you can purchase via the net i.e. ebay, rock auto, etc

 

It is the pre-cat sensor that is no in the exhaust system on the 98+ trucks.

You could have a bung welded in though.

Very loosely related to this thread, but really is off topic... A search on the forum would have answered this question along with another word of warning; use AC Delco sensors only (NGK if you absolutely must). Any other sensor will not last as long.