Q about placement of wideband A/F sensor

[eTiMaGo]

I would think the tailpipe sensor has some way to compensate for the catalytic effect? Not really knowledgeable enough to give you an exact answer on that, but it does get a reading based on the oxygen amount in the exhaust, and that *should* be unaffected by the cats...

But if you're installing your own sensor, definitely get it as close to the header collector as possible

[127.0.0.1]

Originally Posted by eTiMaGo

I would think the tailpipe sensor has some way to compensate for the catalytic effect? Not really knowledgeable enough to give you an exact answer on that, but it does get a reading based on the oxygen amount in the exhaust, and that *should* be unaffected by the cats...

But if you're installing your own sensor, definitely get it as close to the header collector as possible

the A/F sensor must be located in the raw exhaust stream before the first cat.

cat converters would render the readings meaningless

an O2 sensor is located after the cats to check for the efficiency of the cats themselves