o2 sensors and o2 sims... whats the diffrence?

[4thgenowner]

This might sound like a stupid question but what is different about a o2 sim to a o sensor?

[knowledgefreak]

o2 sim is a o2 simulator to take the place of the real one and trick the computer so it gets one constant reading all the time. Kinda dangerous if you are ever in a lean condition.

[SuperRat]

They are used on 96 and up OBDII when the cat is removed. Check out the the 02 sim near the bottom of the page on this link. http://www.fasttoys.net/9398fbodyexhaust.html

[img]graemlins/burnout.gif[/img]

[strange_trp]

<blockquote>quote:</font><hr>Originally posted by knowledgefreak:
o2 sim is a o2 simulator to take the place of the real one and trick the computer so it gets one constant reading all the time. Kinda dangerous if you are ever in a lean condition.<hr></blockquote>

you don't want constant reading all the time from the pre-cat o2 on obd2. if its constant it will set code and you'll stay in open loop.

constant is okay for post-cat sensors, since these sensors monitor the efficiency of the cat. you want a more steady voltage output from that one, which won't happen if you gut your cat and leave in the original post-cat o2. thats what the sims are for. a sim in the place of a pre-cat sensor will set a code and leave you in open loop. bad fuel economy, tcc clutch does not engage, more exh emissions.