Been reading up about O2's and just want to clarify if I got
this right. The O2 on the header just before the Primary cat
is for emission purposes, where as the O2 after the Primary
cat is for diagnostic purposes, correct? If this be the case
and I was to install an aftermarket header, wouldn't a check
engine light be tripped?
this right. The O2 on the header just before the Primary cat
is for emission purposes, where as the O2 after the Primary
cat is for diagnostic purposes, correct? If this be the case
and I was to install an aftermarket header, wouldn't a check
engine light be tripped?