Two O2 probes, one pre, one post cat???

[Rodney Fulk]

The '96 Impala came this way as well. They sell false O2 sensors that feed
an "alls right" signal back to the computer regardless and these fool the
computer into thinking everything is ok.


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Chris
> Sent: Monday, January 08, 2001 5:43 PM
> To: diy_efi at diy-efi.org
> Subject: Two O2 probes, one pre, one post cat???
>
>
>
> Can I throw a question into the arena please? A lot of Japanese cars
> (and others) are now appearing with 2 O2 sensors, one conventionally
> placed one pre the cat, and a second one just after the cat. if one
> removes the cat to remove back pressure on a turbo'd car as a
> performance hike what would the ECU make of this? On some cars I have
> done this to there is never a closed loop mixture problem, nor a check
> engine light either and no fault codes get stored (Toyota). I always
> replace the second probe in a similar location after the now removed
> cat(s). Thanks
>
> --
> Best regards,
>            Chris
>
>
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