Quote:
Originally Posted by mwebb
can not be done
do you mean AFR sensor ? even a scope can not be used .
How 5-Wire Sensors Work (Tech Edge)
with a scan tool testing an OBD2 system ...
you can follow STFT , or EQ ratio graph it if you can . STFT or Eq ratio should swing around 3 to 5 % and center on zero .
quick test is to see if STFT will settle on zero during a steady state . if no
almost always the AFR sensor is skewed or biased high or low , but an exhaust leak upstream of the AFR sensor OR after the cat or a fraked rear 02 sensor can cause rear trim to influence STFT .
an aftermarket AFR sensor in your hand
can not be tested .
the heater resistance can be tested and compared to a specification
but , that is about it .
resistance testing is about as useless as mudflaps on a sledgehammer
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That's what I thought. There is a flow chart in the vx service manual where one of the results is replace LAF sensor, but that is in a chassis.