[DeTomaso] NPC Check Engine Light

[Sean Korb]

In fairness, since 1996 officially, and since 1995 in practice as
OBDII was tested before being mandated. It ensures the upstream
function as well as the catalytic function.  Exhaust gas analysis
every time you drive the vehicle.  I'm still not sure why I have a
post 1996 car in the stable but i wondered why I had a post 1986 car
in the stable a decade ago.  Maybe I'm just slow on the uptake.

sean

On Sat, Oct 8, 2011 at 10:19 PM, Brian Fedoroff <BFedoroff at twmi.rr.com> wrote:
> "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
>
>
>
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso