supercharger emission testing

[Medman]

I just returned from an emission testing center very disappointed after my VX failed the emissions testing miserably. The following diagnostic trouble codes were given:

-Low voltage O2 sensor (Bank 1 and Bank 2)
-Fuel and Air Metering Code: System too Lean (Bank 1 and Bank 2)

The mechanic says that supercharged vehicles with aftermarket exhaust systems usually don't pass emissions testing, especially if the O2 sensors and the Mass Airflow Sensors are removed. I did not install my SC personally, but is it customary to remove these things? I really don't want to have to
RE-modify my VX back to stock, just so I can pass the $20 emisisons test.

Any suggestions?

[Cyrk]

Weird I just had my testing done with not one issue... I am also Supercharged. I doubt that a place that did the install would remove the O2 sensor or the Mass.

[mbeach]

How custom is your exhaust system? There should be O2 sensors fore and aft of each catalytic convertor, are they there?

The MAF should not have been messed with during your SC install, but the system lean code (can be a side effect of a bad/missing O2 sensor) is what really makes me worry. Lean running engines have one foot in the grave.

[Raque Thomas]

I would think that a missing O2 sensor and/or a missing MAF sensor would have your check engine lit up - no, I know that those things missing would throw a code, unless the wiring has been chaged (ie, you can add resistance and fool the system into thinking the MAF is present and working). I'm with Cyrk - I doubt the installer would have removed these items; to do so would open them up to pretty large fines. Did you try another testing location?

[nater]

Intake Gaskets! Intake Gaskets! Intake Gaskets!

They are likely leaking, letting air in that is unmetered. The O2 sensor code is probably a side affect.

It could also be the fuel pressure regulator isn't high enough, but this engine is notorious for Intake Gaskets leaking. If you reused the old ones for the S/C install, there is your likely culprit.

Nate

[Hotsauce]

I did the installation.

I agree, intake or more likely EGR leak.

John C.