Extra Sensor on downpipe?

[AJC]

Ok, so i have a 2001 coilpack 1.4, i have got my Frankspeed mani and brand new cat, and Peter Lloyd system, i have ordered new gaskets and bolts etc and intend to fit the whole lot on saturday, after putting my car on ramps to free up/grease the relevant nuts bolts etc i notice i have an extra sensor on my downpipe, and no place on my Lloyd system for this, i am hoping this is just an EGT sensor and doesnt really have an effect on the ecu and could just be tied out of the way? could anyone confirm this? looks to frank

 

[frank]

i asked someone on here the other week if his mil light came on when he removed his 2nd lambda, and he said no it was fine

 

[frank]

http://www.micra.org.uk/threads/exhaust-will-it-fit.52169/#post-531546
^

 

[AJC]

Gonna be a noob here, but why would nissan fit 2 o2 sensors in less than 1 meter? thats why i thought it may just be an EGT sensor for some form of redundant reporting or maybe even some form of EU diagnostic compliance

 

[frank]

i think most obd2 system cars have 2 or more ? (pre and post cat)

 

[AJC]

must just be a redundant system then i am guessing, if others have it working fine. That said it could be just to see if the cat is working and doing its job, but if there is no secondary reading then it cant compare the 2 figures, so as far as the ecu is concerned everything is working fine

 

[MarkTracey]

i think its just a heat sensor to make sure the cat doesnt overheat, seems to be fine sitting in the engine bay.

 

[Belly93]

possibly to ensure the cat is working correctly check emisions readings before and after the cat?

 

[micra 2000]

for your mot would you have to have both o2 sensors fitted ??? if so see if there is another downpipe with a second fitting point

 

[MarkTracey]

As long as the emissions are ok it should pass, or you could just put the standard pipe back on for it

 

[AJC]

If it fails the MOT coz of it, i can just have a hole drilled in it and a bolt welded to the pipe and refit the sensor, simples

 

[flipside]

the second sensor is lambda 2 its to check if the cats doing its job.

 

[AJC]

So its ok to run without it?

 

[tomwest]

yeah should be fine. wont make a difference to performance anyway!

 

[AJC]

Cool, well its all fitted now, at last and worth the 4 hours to fit, had to do it on my own as my brother had plans this weekend

 

[nathan.warren69]

how does it seem? benifits, gains etc?

 

[AJC]

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