Over fueling

[winchman]

MOT man tells me its overfueling?
Need to change my rear Lambda sensor?
Code he thought was PO171.
He told me if I get it from a scrap yard get both and fit both?
Its a 2000, 1.0 petrol with the little black boxes on the top of the HT leads, sorry bit of a techno phobe.
So if I get a scrap one any other vehicles fit as only one new Micra locally?
Are the universals any good?

 

[frank]

the coilpack lambda,s have 4 wires winchman, and a different plug
you might be able to swap yours front to back, and also bear in mind that the coilpack MAF,s are prone to P0171 issues iirc

 

[winchman]

Thanks
So what will it do swapping front to back?
MAF is that the little air flow wire thingy?
So before I go a wrestle with it how can I test them to be certain?
Going to scrappy later but what others will fit?

 

[frank]

you can test them with a meter on the signal wire (the middle wire on the 3 wire type)
if the front one is fluctuating from about .3 to .6v, 2 times a second at cruise, its working fine (the rear one should be more stable)

 

[winchman]

Thanks I assume I would need some sort of reader and soft ware as my meter wouldn't read that fast?( its a fluke 75 I think)
I will count my wires.
So assuming I can find a coilpack 1.0l in the scrappy what bits should I have as spares?

 

[winchman]

PM on its way, well perhaps not cant fathom out how to do it, off to scrappy soon so will report back later

 

[winchman]

Up date, its fine till the temp gauge reaches halfway, then its hunting at tick over.
Managed to get coil packs throttle body and Lambda sensors from an identical Micra, should I have got anything else? Changed Front Lambda, no different, drove to MOT man, he had a good poke around and throttle body gasket was caked in silicone, so removed the body and fitted my spare as it has a good gasket, still same fault, so took it back to MOT man and he re read the codes and they now reset not certain but a lot happier, I still wish I knew how it all works

 

[frank]

sounds like a longterm fueltrim issue maybe ? clear the codes and it resets the fueltrim, then it comes back after a few days
did you change the rear lambda winchman ?

 

[winchman]

Not yet I was hoping I have solved it?
The codes wouldn't clear until I changed the bits
Where can I read up on this so I get a better understanding of whats going on?
I was thinking of buying one of these
http://www.ebay.co.uk/itm/Android-T...iagnostic_Tools_Equipment&hash=item3cd3c161ad
I assume this would show me whats going on? Would it allow me to reset codes?