Over the past 4 months I have had 3 lambda sensors fail, Im running closed loop on my 4x4 saff, stage 3. Does anyone have any idea what could be causing the failures? Also what does the managment do under closed loop conditions if the lambda is not returning the correct signals?

 

im sure if a lamda sensor fails it runs rich

are they genuine lamdas or aftermarket?

if aftermaket could be the heat destroying them

 

bit weird that.... im sure if the lambda fails it would revert back to the standard map...on stu's chip would still be about 0.90% c.o at idle


ive got a spare genuine lambda if you want to try it mate....?

 

The most likely cause is becuase you are running rich all the time. O2 sensor do not like it, their job is to stop it happening. However, if the mapping is too far out the O2 sensor can not do it's job properly.

 

If the sensor is left switched on when the engine is off it will burn out. Worth checking to make sure it switches off...

 

Mine isnt in the exhaust housing its a full sizeone

 

It runs closed loop witrh CO of 0.7% at idle when the sensor is working so its not running rich

 

That is at idle, how long per journey to you stay at idle?

 

Aftermarket which could be my problem, what is the reccomended sensor?

 

not very long, the last sensor lasted less than 100miles!

 

I would get on a rolling road and check you fueling throughout the rev/load range. 3 O2 sensors in a row, that quicky, is more than bad luck.

 

I have just ordered a new bosch LS02 sensor, hopefully this will allow me to finally have a sensor that lasts more than a few miles

 

Ive used the LS02 sucessfully on cars that have now covered over 30000 mile without incident, many of them are members of PF too, so you should be fine with that one.

When we made this system we tried lots of cheapo brand sensors and all had teh same problem, early failure.

 

I got the part number from B9KOS sensor which came from you origionally I think stu so I knew it would be a good bet to get one of them, on a side note my wasted spark coil pack driver arrived today (i won it on ebay) so i have something to do on christmas day! solder it into my ecu

 

Excellent.
If you have any problem at all, let me know, happy to help you mate.

 

thanks Im sure it will be ok, the instructions are fine and im ok with this sort of thing.

 

Cool, you will love it, totally different engine once converted to wasted spark.

 

Hi Stu

All fitted, bit of a rev counter problem and also I have sent you a PM about the instructions, other than that excellent, also have fitted my bosch LS02 and so far so good.