a/f guage on a 4efte engine

daryl0510 · Posted: Mon Nov 02, 2009 12:53 pm Post subject: a/f guage on a 4efte engine

so exactly which wire do i use! seems to me that there are two O2 sensors! 1 has 2 wires( black & white) and the other only has 1. sooooo, which one hooks up to the rich / lean guage (autometer) ?

haydn28 · Posted: Mon Nov 02, 2009 2:51 pm Post subject:

the 2 wire one is exhaust temp..

u'll be using the single wire one... look for it on the downpipe.

take my advice and install an independent unit..
as the voltage drop on ur sensor can affect gas mileage in daily driving.

i have another 4efte o2 sensor calling $200