Fault resetting and lambda readings

[jackmidd]

Hi, new to this forum, just a quick question that hopefully someone can answer. Firstly, if i reset a fault code without fixing the actual fault, should it reappear when i scan for faults again? Secondly i failed my MOT last week on the emmisions test, i was advised that i probably needed a new lambda sensor. After a bit of digging in the engine bay i found two broken wires coming from the lambda harness, i've since rejoined these, not getting any fault codes relating to the sensor but when i run vcds and look at results for sensor data the reading varies from zero to minus 15% - what sort of reading would a working sensor produce?

Finally, how long should i run my car before performing a readiness test? pass/fail changes the longer the car runs.

[a8 tech]

ignore readiness code regen as it will re learn in time

are you looking at mvb 32, if so ideal long term and short term trim should be 4%

but resetting the fault memory deletes the read data

look at mvb 30, 31 upward for lambda voltage lambda 1 being ideal afr and make sure the voltage readings are in order for rich/lean mixture

read this http://wiki.ross-tech.com/wiki/index.php/Fuel_Trim_Info