I'm due for a smog test this month on my 1996 Tacoma 2.4L.
The last couple smog checks, the NOx value has been approaching the limit for the 15 MPH test. No problems with the 25 MPH values yet. I used lots of Seafoam in the gas, oil, and vacuum line -- and drove the truck hard -- prior to the 2010 smog check. I also removed the EGR valve and attempted to remove some of the carbon buildup but wasn't very successful.
As you can see, this truck does not get driven much at all... Do I stand a chance of passing the 2012 smog? ... If not, what do you recommend?
FWIW, after the 2010 smog check, the original MAF sensor failed and was replaced with a new one.
Note: Values in red are the maximums allowed.