Can the 2nd O2 sensor can be disconnected?

Can the 2nd O2 sensor can be disconnected? was created by mgfmad

Posted 14 years 9 months ago #9696
I have the later set up on my TF with the O2 sensor in the exhaust downpipe and a further O2 sensor after the CAT. Is there a way to disconnect this sensor so I can fit another exhaust but not have the engine management light coming on?

Reason for asking is, I have a Milltek on my MGF that I thought about fitting onto the TF, as the F is MEMS2 it has the earlier exhaust with the longer bend to the CAT so I would need to fit the MGF CAT as well so no place to fit the 2nd O2 sensor.

MG TF LE500 27 of 500

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Replied by David Aiketgate on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9697

MGFmad;9696 wrote: I have the later set up on my TF with the O2 sensor in the exhaust downpipe and a further O2 sensor after the CAT. Is there a way to disconnect this sensor so I can fit another exhaust but not have the engine management light coming on?

Reason for asking is, I have a Milltek on my MGF that I thought about fitting onto the TF, as the F is MEMS2 it has the earlier exhaust with the longer bend to the CAT so I would need to fit the MGF CAT as well so no place to fit the 2nd O2 sensor.


Yep, you fit a MIL eliminator box on the second lead. basically it's a box of tricks that fools the ecu into thinking the sensor is still there.

David
:shrug:

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Replied by cjj on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9700
Yep, I have one of these fitted on the post cat Lambda sensor. Works well.
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Replied by David Aiketgate on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9702

CJJ;9700 wrote: Yep, I have one of these fitted on the post cat Lambda sensor. Works well.

Oh good. Glad i wasn't talking ******************.:yesnod::lolm:

David
:shrug:

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Replied by mgfmad on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9703
Thanks guys - good to know:thumbsup:

I take it that ebay is the place to go for such a device.

MG TF LE500 27 of 500

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Replied by rough luck on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9727
This may sound daft but cant you leave it connected and clip it somewhere out of the way, it would still take readings from normal outside air

Youtube channel of mods an track pics

http://www.youtube.com/user/busternorris?feature=mhum

Website: http://www.roughluckracing.com/ MG Rover Mobile Repairs Nationwide and Western Europe

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Replied by David Aiketgate on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9742

MGFmad;9703 wrote: Thanks guys - good to know:thumbsup:

I take it that ebay is the place to go for such a device.

http://cgi.ebay.co.uk/MG-Rover-ZR-ZS-F-TF-25-45-Decat-MIL-Eliminator_W0QQitemZ260542569085QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3ca98c1a7d:yesnod:

David
:shrug:

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Replied by David Aiketgate on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9743

Rough Luck;9727 wrote: This may sound daft but cant you leave it connected and clip it somewhere out of the way, it would still take readings from normal outside air

Interesting thought, but I don't think what the sensor is expecting is clean air.:dunno:
The O2 reading would be too high.

David
:shrug:

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Replied by andycolm on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9755
The way I read it is the second sensor is just there to sample post cat emissions, if they are different to what it expects it will light up the dash light. No effect on the running of the vehicle.

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Replied by rough luck on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9759
yeah thats my sort of idea too, so if it just taking in clean air, it will think the cats working.....mad but simples

Youtube channel of mods an track pics

http://www.youtube.com/user/busternorris?feature=mhum

Website: http://www.roughluckracing.com/ MG Rover Mobile Repairs Nationwide and Western Europe

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Replied by cjj on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9766
Funnily enough, I would have thought a high O2 reading is not what it is looking for. High O2 readings would suggest incomplete combustion.
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Replied by andycolm on topic Can the 2nd O2 sensor can be disconnected?

Posted 14 years 9 months ago #9804
Correct CJJ, it has a preset range of values it is looking for. Higher or lower than this and it lights the MIL light and logs a fault code as the cat is not working to its parameters.
I have no 2nd O2 sensor as mine has an early exhaust on a late MEMS 3 engine in an early MEMS 1.9 car, no light in my dash so it doesn't bother me.
Seems to run just fine without.
Take the bulb out from the dash maybe? :whistle:

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