zmanx

How many 02 sensors does a 99 z28 have ? I havent had much time to get under it lately. Also im throwin a code for an 02 sensor and it says Bank 1, which one would be bank 1 ?

Levman74

iTrader: (3)

There are 4 O2 sensors, 2 pre-cat and 2 after-cat, Bank one is on the left side.

2001NBMZ28

If you're stock you have four. Bank 1 is drivers side, Bank 2 is passenger side - and Sensor 1 is precat, Sensor 2 is post cat. The code will tell you which one it is. 02 codes always specify Bank __ Sensor__.

zmanx

Thanks guys, thats exactly what I needed to know.

2001NBMZ28

Don't buy any without posting the code first - could be a symptom of something else going on, for example the post-cat sensors monitor the efficiency of the cats...you may already know, just don't want you buying one you don't need.

zmanx

The code discription does say bank 1 number 1, so that would be drivers side pre cat , is that right?

2001NBMZ28

Yes, bank 1 sensor 1 is the precat sensor, driver's side.