FORD FOCUS 02 PLATE 1800CC ZETEC

[radiosolutions]

ENGINE MANAGEMENT LIGHT KEEPS COMING ON. FAULT CODE IS P0420 CATAYTIC CONVERTER SYSTEM BANK 1 EFFECIANCY BELOW THRESHOLD. HAVE CHANGED 02 SENSORS AND REPLACED CAT BUT LIGHT STILL COMING ON, WITH THAT FAULT CODE. ON LIVE DATA SHRTFT B1 S1 READS 3.9 %. SHRTFT B1 S2 READS 99.2 %. THIS IS ON TICKOVER IS THIS CORRECT. ALSO I CHECKED SENSOR 2 AND ON THE GREY WIRE IS THIS SUPPOSED TO BE EARTH. THANKS

[wizz2c]

those figures indicate lean mixture,have you checked for air leaks?

[Meat-Head]

DO YOU NEED TO SHOUT?

LOOK FOR A RUBBER PIPE UNDER THE INLET FANNYMOLD