[DeTomaso] NPC Check Engine Light

[Brian Fedoroff]

"In theory, if the AF Ratio sensor in tandem with the ECM and fuel-pulse 
delivery is fast enough and is working, the two catalytic converters and 
downstream O^2 sensor is just a back-up system doing nothing."
 
Well, just because you read it on the internet doesn't make it so.  The
downstream
sensor is also used for fine tuning NOx control on every vehicle since the
1990s.  In other words,
it also is controlling the engine air/fuel ratio to some extent.  I wouldn't
screw just any sensor in there if your car has to pass an emissions test.
Are you aware
that there are several different heating elements used, depending on the
application??
Using the wrong one can make the heater fail in a short amount of time, and
your check 
engine light will be back on in a jiffy.

 

 

Regards,

Brian Fedoroff