Just failed my trucks last Etest pretty bad and was wondering if anyone has any thoughts on what the problem could be?

Results are:
40KM/H
READING/LIMIT
HC 285/ 85
CO% 4.23 / 0.47

CURB IDLE
READING/LIMIT
HC 280/200
CO% 6.62 / 1

It failed it pretty bad, i know the 02 sensor is probably bad since its original but why the high CO?

 

how old is your cat?

 

brand new cat installed with entire exhaust system minus the manifold last january

 

and it passed fine 2 years ago?
i always make sure to run the engine so its good and hot before you take it in.. and also a oil change a week before

 

im pretty sure it was faked two years ago as it was running worse than it is now

 

o ok i though you had the truck for a while... i have had a 87 and then a 94 and 93...... i have never had issues doing what i posted above the only time i failed was when i was using a ford ranger cat converter... is your check engine light throwing any codes?

 

nope no codes are being thrown.. if the o2 was malfunctioning would there be a code 100%?

 

no mine blew out before and it was loud as but no cel came on.... wait for someone eles to chime in ...

 

yeah im hoping for that, thanks dude

 

ife you know the person at the drive clean once i used my 4runner to get my buddys 4runner to pass.... ust use your vin number ...also if your really stuck i might have a hook in hamilton

 

try and see if you can find i think its made by mobile, but its called "low emissions gasoline" and it might give you the "edge" lol.

 

Run super thick oil in it - 40 weight before you do your test. This could make a difference, my friend failed and then changed his oil, and a few other things, and then passed.
I dunno....
Move to Alberta.