Important! : Lambda sensor what to do on new exhaust system drill or disable?

15th November 2015, 22:57

SO got this system but having work done to it.

Looking at it theirs no sensor input to screw in. Is this matter of drilling hole into it and attaching nut and fixtures etc and adding lambda sensor?

Os is their a way to remove one sensor and not get any warning lights on dash.

Some advise on what best option would be thx.

15th November 2015, 23:37

You are running a car with two lambda sensors I take it? If it were a mk1 it'd not be a problem but I digress. Sleeve your second second and cable tie it up out of the way so it can read clean air then no light comes on

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15th November 2015, 23:42

Quote:

Originally Posted by Gandi699

You are running a car with two lambda sensors I take it? If it were a mk1 it'd not be a problem but I digress. Sleeve your second second and cable tie it up out of the way so it can read clean air then no light comes on

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Yeah checked it tonight I have one a the manifold and one after the cat. Sleeving the 2nd sensor will this not affect the mix or casue problems for fule to air ratio or that sleeve is a bypass tricking into thinking as you say clean air.

Also how are decat systems on co2 and MOT do they pass as from reading last test am just boarder line on co2 emissions. any way to improve this. Maybe get a terra clean on system?

15th November 2015, 23:53

All the second lambda does is monitor the gasses coming out of the cat, if it's all good your light is off if not its on so you can then be notified of a cat fault as the readings are too high. So sleeving it away from the exhaust with decat in place it's not reading the higher emissions due to missing cat.
Mot rules now say a car that has a cat fitted as standard should have one fitted physically (or something that looks like a cat hehe) whether it will pass emissions with decat is another matter, most will fail but some people have done it apparently but then you now must refer to the point about a cat needing to be there., plus it's another thing you can be done by vosa spot checks for I think however how often that happens is in reality is hard to say.
My view is you are best off running a mk1 system with under floor cat or a underfloor sports cat ideally but they are pricey to keep it all legal with no fuss. Then you can run a 4 branch manifold, but you may need to alter to the oil filter setup on a mk2 8v at least. Or just keep swapping a cat on

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16th November 2015, 00:18

Quote:

Originally Posted by Gandi699

All the second lambda does is monitor the gasses coming out of the cat, if it's all good your light is off if not its on so you can then be notified of a cat fault as the readings are too high. So sleeving it away from the exhaust with decat in place it's not reading the higher emissions due to missing cat.
Mot rules now say a car that has a cat fitted as standard should have one fitted physically (or something that looks like a cat hehe) whether it will pass emissions with decat is another matter, most will fail but some people have done it apparently but then you now must refer to the point about a cat needing to be there., plus it's another thing you can be done by vosa spot checks for I think however how often that happens is in reality is hard to say.
My view is you are best off running a mk1 system with under floor cat or a underfloor sports cat ideally but they are pricey to keep it all legal with no fuss. Then you can run a 4 branch manifold, but you may need to alter to the oil filter setup on a mk2 8v at least. Or just keep swapping a cat on

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Thanks for all the details their gives me a lot more to go off and almost forgot about vosa. Might just come to selling the system or look to building a full system with sports cat rather be street legal than having vosa sting me, or any other cases.