Faking an O2 sensor

[Programmer]

Yes--that's pretty good for a value. The 2nd O2 is just making sure
the cat's doing its job, and that the first O2 is still switching rich/lean
to provide enough extra fuel and additional O2 to keepthe burn in the cat
going. The rear O2 is the system "monitor" if you will...

-----Original Message-----
From: Carl Summers <InTech at writeme.com>
To: diy_efi at diy-efi.org <diy_efi at diy-efi.org>
Date: April 16, 2000 4:12 AM
Subject: RE: Faking an O2 sensor


>Seems to me I've seen the after cat O2's looking around
>650-700mv......anybody been watching one with a scanner???
>-Carl Summers
>
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>-----Original Message-----
>From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
>Behalf Of Peter Gargano
>Sent: Sunday, April 16, 2000 2:56 AM
>To: diy_efi at diy-efi.org
>Subject: Re: Faking an O2 sensor
>
>
>So, what do those US$90 boxes do? Anyone scoped them?
>
>Scott Croughwell wrote:
>>
>> The "downstream" EGO sensors on OBD-II cars are easy to fake out if you
>> remove the cats.  Just leave the downstream EGO's dangling in open air.
>> Voila!
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