Forwarded: Re: Bosch 4&3wire sensor

RABBITT_Andrew at mv8.orbeng.com.au RABBITT_Andrew at mv8.orbeng.com.au
Fri Nov 8 01:16:38 GMT 1996


check out the price on a Ford Mondeo HEGO, they're 4-wire jobs.  On 
the three-wire sensors, I'd guess (FWIW) that the heater is grounded 
through the exhaust pipe, the other two wires are a differential 
(floating) signal.  The fourth wire is just a ground for the heater.

From: (Fred Miranda) fcmtb at ix.netcom.com:smtp
Date: ## 11/07/96 15:28 ##
Doug,
NTK makes low buck 4 wire units.
Mitsu Eclipses use them.

Fred

At 07:19 AM 11/8/96 +1100, you wrote:
>Hi in a 4 wire O2 sensor you have sensor gnd, earth, heater =ve, and
>signal
>in a 3 wire heated is it common ground, and there fore will it upset my
>autronic SMC if i use the chassis ground effectively for both for this
>function. if i then conect sensor ground to chassis will this upset
>things????
>
>have plenty of 3 wire ones free, 4 wire ones 350 dollars
>
>
>-- 
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