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That depends on the type of failure.
If there is a problem with ignition, you may see a misfire indicator when you perform diagnostics, or there may be elevated hydrocarbons in the exhaust.
If there is a problem with the EGR or injectors, you may see elevated carbon monoxide and hydrocarbons.
If the spark-plugs and wires have never been changed, that's a good place to start.
If you've done that and still no improvement, make certain that the EGR is functioning properly, but the diagnostics should tell you that.
If everything else has checked out, try replacing the injectors. Reconditioned injectors are actually a good decision for older vehicles, since we don't always want to put that much money into them, and the reconditioned injectors typically work just as well as new.
What else can I help you with?
What can cause a 1999 Saturn SC2 to fail the smog test after the battery was replaced?
Have it scanned to determine problem
Will a bad egr cause smog test fail?
yes it suppose to circulate the smoke if clogged smog test will fail
Would your car pass a smog test with the brake lamp on?
Depends on your state. Where I am a warning light on is a fail.
Would service engine light come on if gas cap bad?
On some vehicle it does as it is supposed to be vented through a canister and not the cap for emissions reasons. Another reason you fail a smog test if check engine light is on.
Where is smog pump on 2001 Saturn ls?
It doesn't have one.
Will you fail smog in California if serice engine light is on?
Yes, automatically.
Will my1999 Saturn sl pass smog with warn timing chain and gears as long as you did compete tune up including full seafoam soaking of injectors and put seafoam in the tank?
Unless the vehicle is misfiring, or there is a Service engine soon light is on, having worn timing components will not cause you to fail smog
Why do cameros fail the smog test?
it's actually camaro. and they don't fail to begin with out of the factory, you must have done something to the exhaust to make it fail
Can you remove smog pump 1995 Chevy caprice?
Yes, but you have to have the PCM programmed for the removal. You might fail visual portion of a smog check, however.
Your 98 Chevy s10 fails smog test have replaced everything but egr valve and oxygen sensor what else can you do?
A faulty EGR valve can cause a 98 Chevy to fail a smog test. The oxygen sensors should also be tested as they can also cause a 98 Chevy to fail a smog test.
Will a bad catalytic converter cause you to fail the emissions portion of the smog test?
Yes!
Is it possible to tan on Saturn?
No, since the atmosphere is filled with smog and gas which blocks sunlight, making Saturn very cold, -170o C (-274o F).
