hi guys new to this forum reason being my granny has a fusion and when she was on the dualer today the engine managment light came on the car aint showing any signs of it not running right which makes me think its the lamba sensors was wondering if there is anyway of telling without a diagnostics computer like you can do with vauxhaulls (the paperclip thing) any advice much appreciated thanks in advance cheers struan

 

Use a digimetre to look at output from lambda.
tabetha