I worked a few years as a smog tech and there are a few things that can help. I suggest a complete tune up and an oil chage. The oil change is very important if the vehicle is close to passing; your oil will over time pick up hydrocarbons and NO2. Then the PCV system picks up these vapors from the crank case and introduces them into the intake air charge where it is burned. Like I say if the vehicle is close to passing do a tune up and change the oil; it should pass then, barring the EGR valve is not defective.

John Luttrell
2001 4x4 short cab, 3 inch lift with 33 inch mudders and Powertrax no-slip in the rear


1991 Jeep YJ, 4 inch suspension lift on 33" BFG's