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        General >> Give/Need advice to/from others >> HO2S ?? one or two ??
        
(Message started by: a11mcr on Jan 8^th, 2008, 10:37pm)

Title: HO2S ?? one or two ??
Post by a11mcr on Jan 8^th, 2008, 10:37pm

Hi all just lookig at the manuals on the main site (got some work planned for the weekend).
Now it says there are two HO2S sensors (front & rear) but mine only has the front is this right? 2.3 16V.
Hope someone can shed some light on this (hunting at idle and very low MPG).
Cheers
mark

Title: Re: HO2S ?? one or two ??
Post by jonnycab on Jan 8^th, 2008, 11:52pm

Yep, the 2.3 only has the one (pre-cat) sensor ;)

Have you had a scan done to see if there any fault codes ? :)

Title: Re: HO2S ?? one or two ??
Post by a11mcr on Jan 9^th, 2008, 9:14am

Cheers.
No fault codes!
How can you get 23-24 MPG and mine gets 16-18MPG round town ??? even when i take my lead boots off ;D
Mark

Title: Re: HO2S ?? one or two ??
Post by solarpanel on Jan 9^th, 2008, 6:35pm

dont beleive all you read,i could not get that out of my 2.0 manual in town,def not with 2.3 auto est either and my cossie 16 ish.

Title: Re: HO2S ?? one or two ??
Post by ADroste on Jan 9^th, 2008, 8:55pm

on 01/08/08 at 23:52:49, jonnycab wrote:

Yep, the 2.3 only has the one (pre-cat) sensor

Not necessarily. Russian wiring diagrams say that there was a post-catalyst sensor before 4/97 in manual and auto 2.3 DOHC.

Regards
Armin

Title: Re: HO2S ?? one or two ??
Post by jonnycab on Jan 10^th, 2008, 1:28am

on 01/09/08 at 18:35:32, solarpanel wrote:

dont beleive all you read,i could not get that out of my 2.0 manual in town,def not with 2.3 auto est either and my cossie 16 ish.

I'm not fibbing, honest ;)

Update.......I've deleted what I wrote before, in favour of the following link, that proves that the 2.3 should be running at a much higher mpg that the late teens....

....http://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl?board=Advice;action=display;num=1199976164

Title: Re: HO2S ?? one or two ??
Post by jonnycab on Jan 10^th, 2008, 2:11am

on 01/09/08 at 20:55:08, ADroste wrote:

Not necessarily. Russian wiring diagrams say that there was a post-catalyst sensor before 4/97 in manual and auto 2.3 DOHC.

Regards
Armin

Maybe something got lost in translation somewhere along the line :-/

Are there any 96/early 97, 2.3 owners on here that can confirm the existance of a post-cat lambda on their vehicles ? :)

Title: Re: HO2S ?? one or two ??
Post by Kjetil S on Jan 10^th, 2008, 7:37am

I'm pretty sure I've seen a post cat sensor on my 1995 2.0 16v

Title: Re: HO2S ?? one or two ??
Post by Tompion on Jan 10^th, 2008, 7:56am

My '97 2.3 has a blank plug screwed into the exhaust post cat & the socket for a sensor tucked up by the autobox.
I queried it with Trevor at fordpartsuk sometime ago & he said mine had never had one (checked against the VIN).

Title: Re: HO2S ?? one or two ??
Post by peteHull on Jan 10^th, 2008, 8:53am

on 01/10/08 at 07:56:36, Tompion wrote:

Interesting, I believe mine's the same, 'S' Reg
I wonder if you fitted one it would be recognised and used by the ecu and also if it did, weather it would make any difference.... just a thought :-/

pete

Title: Re: HO2S ?? one or two ??
Post by TiberiuS on Jan 10^th, 2008, 4:45pm

Guys, excuse me if I'm miles off here but the second lambda is normally a 'cat efficiency sensor' and is a requirement of the OBD-II emissions regulations (I think came into force in 1996?), it has nothing to do with the running of the engine like the first (pre cat) one does. As the Scorp is regarded as a 'parts bin special', this might explain things ;)

No mine didn't have one either and it was an July/August 1996 build, only the pre cat like Jonny's.

Title: Re: HO2S ?? one or two ??
Post by ADroste on Jan 11^th, 2008, 3:35pm

In minimum, it must have been intended to fit the post cat sensor as you can see here in figure 2 of picture 7. http://www.fordscorpio.co.uk/manual/exhaust/exhaustcat16v.pdf

Wiring diagrams (English as well as German) say two sensors in 2.3 DOHC manual "As of before 04/97", and in auto "Sensors before 04/96". So consequently only pre-cat sensor in 2.3 DOHC manual "as of 4/97" , but wondrously "As of 04/97 in auto. So, what was fitted between 4/96 and 4/97 in auto? Maybe only a print msitake.

Regards
Armin

Title: Re: HO2S ?? one or two ??
Post by solarpanel on Jan 11^th, 2008, 10:25pm

my 95 2.0ltr has two sensors 97 est has one