2012 galant went for smog no check engine light runs perfectly fine.. Once it went for a smog on the test the check engine light came on and it failed y is that

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1998 GMC Sonoma sls 4.3 stepside shortbed

when you disconnected the battery you cleared all codes and your emissions[ smog/emissions need to run their cycles to be smog test ready as of now you will fail test ------https://smogcheckvacaville.com/general-motors-drive-cycle-for-smog-check/ ------------------https://repairpal.com/how-to-perform-a-basic-drive-cycle

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Feb 12, 2024 • GMC Cars & Trucks

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Okay well I take my car for smog 2012 galant and while on diagnostic check engine ligjt goes on? Y

This can sometimes happen depending on the type of smog test being done.
The best thing to do is take your car to a local shop or Autozone (autozone will do this for free) and have them pull the trouble codes and reset your light.
There might be a problem that is on the verge of occurring that the smog test helped reveal.

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Oct 14, 2017 • Cars & Trucks

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HOW To: tune up Geo Prizm 1995, myself.

wow ,no posted smog report, (the failed gases) now that makes this 10s harder, and for sure more expensive.....
many post,. why not just add to one post
click comments and add.
or edit one. post.
all engines that fail smog run fine. (so says all owners)
(fine means zero,) in the real world.
what's worse is owning a 1995 in USA, and must get sniff tested.
(cant fool that method) no report by you, (paper)

ignore all statements by all smog testers,
only one statement (it fails!)
all others are lies, guessing and BS.
after all if they were fully trained and skilled they'd have a real job.
a fact. (or they get huge retirements from the state?)
The car needs to be check by a pro.
it needs to be scanned, with a custom scan tool that is not sold in any auto store until 1996 happened.

but if that NOT IN THE CARDS./ no money for a real ASE tech?
then yes, do a tuneup..

1: spark plugs. and new wires, cap and rotor.
2: filters. and fresh engine oil, (the oil can be full of gasoline is why)
3: the cat may be ok, is spending a fortune on that good?
on a wild guess,? like your smog guy quipped?
that be your call. no? (shot gun method or testing) your call.

in a shop they would get the engine running perfectly.
in closed loop hot and light cruise.
A NEW front 02 sensor for sure.
then they test the cat last, the CAT is always last.
i think this car has 3 way cat too, so is really 3 cats in one.
all 3 must work. or you fail... (for sure)

what if only NOX gas failed.????
if yes, we fix EGR first. then CAT last. (they work as a team)
what gases failed matters
and was not stated by you.
in a real shop they can sniff front of cat and rear
and tell you ,
bad engine, or bad cat. in minutes.
or both, sure.

bad engine means
1:engine is bad.
2: EFI controls failing, (fuel or spark)
3: misfires. (even some humans cant hear, omg)
4: and many more. but no smog sheet posted, no savvy.

a pro shop knows the pre cat gas levels that are normal.
if they are, then the cat is bad.
end story.

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Dec 28, 2016 • 1995 Geo Prizm

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What might cause codes p0325 , p0304 to turn my check engine light on during smog test on my1998 Nissan Altima 2.4L No kicking No noise except the drive belt which just started after smog test

This is common in the Nissan's could be the cam and crank sensor these go at around 70000 to 120000 should do both at once to be safe. that will fail an emissions test for sure. hope this helps

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Mar 09, 2016 • 1998 Nissan Altima

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WONT PASS SMOG.. CHECK ENGINE LIGHT IS NOT ON

Even after resetting the computer it may take several days to reset the internal workings of the computer. When i went for my E Test they asked me if my check engine lite was on in the last thirty days and if I reset the computer I was to run the car and come back in two weeks. I drive an 2005 car.

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Jan 17, 2016 • 2003 Mercury Sable GS

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Will a 2008 liberty engine work on my 2012?

short block
long.
or long with all manifold.???????
the 3.7L
fit , work, run, run perfect and pass smog? (all diffrent)!
in some states they check engine serials and dont allow, down grades. (calif is one)

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Apr 20, 2015 • 2012 Jeep Liberty Sport 4dr SUV 3.7L V6...

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Kia spectra check engine light

Hey Connie, There are numerous reasons the check engine light will come on... from a loose or not sealing gas cap, to numerous sensors...if it runs great, gets good mileage..>>>???

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Jul 05, 2017 • Cars & Trucks

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Engine Check light

Take it to autozone or another place like it and have them read the codes and tell us what they are.

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Jun 19, 2013 • 2011 Jeep Wrangler Sport

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How to reset engine lite in dash

Check engine light comes on and off, these are indication that there is some error code stored in your vehicles ECM. The engine module computer needs to be scanned. These will give the code and as per the error code the further problem can be detected and confirmed. The engine light indicator blinks or remains steady on dash when engine computer noticed any problem with any engine electrically operated components.

For more help, I suggest you to refer the help links provided below. These will let you know more about which areas to look, check, when there is engine light coming up on dash panel.

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Click the link below: -------