Diode for PLX wideband o2

s300 and SManager software questions & answers
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Furble
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Joined: Fri Jun 12, 2020 12:55 pm

Diode for PLX wideband o2

Post by Furble »

One of the tech articles reads: “Check the voltage value with a multimeter at the output of the wideband and see how it compares to the O2 voltage above. If there is a difference, install a diode with the diode cathode pointing to the FJO and the anode pointing to the the O2 plug (green sensor ground wire) The diode is type 1N4001, Radio Shack part # 276-1101. This prevents what is called a ground loop.”

Question: Is the same diode valid for the PLX wideband?
Furble
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Re: Diode for PLX wideband o2

Post by Furble »

Since it will probably be asked, the plx IS grounded direct to the thermostat housing and the voltage offset is very small. Curious if I could get it down to zero and perhaps this diode trick would accomplish that.
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Spunkster
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Re: Diode for PLX wideband o2

Post by Spunkster »

define very small
Furble
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Re: Diode for PLX wideband o2

Post by Furble »

-0.04 volts
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Spunkster
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Re: Diode for PLX wideband o2

Post by Spunkster »

Don't worry about it.
Furble
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Re: Diode for PLX wideband o2

Post by Furble »

Roger that.
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