Quote:
Originally Posted by WildBillyT
FWIW O2 sensors need to be at a particular temperature to operate correctly. Too far downstream makes them too cold, too far upstream is too hot. This is why some (all?) long tube headers are "illegal".
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But a 94+ should be a heated 02 sensor no? The tuner will tell you if they are acting sluggishly or are fine, but that gasket seal between the engine and 02 worries me. Later on down the road if they leak a little you could have some weird 02 readings etc.