ecu code 43 what causes it?

system · March 25, 2002, 11:17pm

i got an ecu code 43 shortly before the b16a1 swap and i thought i would rid of the problem when i changed engines and now the car wont start…
what should i look to replace to fix code 43 thanks
justin

Answer · March 25, 2002, 11:55pm

code 43 is 99,9% a bad O2 sensor… I think the code call for a “fuel supply system” problem… but if the car won’t start, it’s probably not just the O2 sensor…