How far ahead of your registration month can you get an emissions test?

[.455_Hunter]

My wife's vehicle is due in May and will need an e-test. It currently is NOT throwing a check engine light. If I get it tested now, will the test be accepted in May? Thanks!

[eddiememphis]

90 days before due date, according to my friend AI.

[.455_Hunter]

90 days before due date, according to my friend AI.

I guess I didn't ask the question the correct way. AI wanted to tell all about how long after your expiration you could register.

[SAnd]

You can do a drive by test-
https://dmv.colorado.gov/rapidscreen
You have to do it early so if you want to do a drive by check it now.
When you get your renewal it will tell indicate that you're already tested.
Good luck

[eddiememphis]

I guess I didn't ask the question the correct way. AI wanted to tell all about how long after your expiration you could register.

He can be an obtuse prick sometimes.

I have been switching between ChatGPT and Grok. Chat seem to have a lot of superficial info whereas Grok has less info but is more in depth.

[Hummer]

Sometimes a check engine light comes on due to a change in atmospheric conditions, at least on my old Tundra. Real mechanics here might have a different view. You can disconnect the negative cable from the battery to reset. If my check engine light comes on when I have a test scheduled, it's a quick fix and the test passes easily.

[ben4372]

Sometimes a check engine light comes on due to a change in atmospheric conditions, at least on my old Tundra. Real mechanics here might have a different view. You can disconnect the negative cable from the battery to reset. If my check engine light comes on when I have a test scheduled, it's a quick fix and the test passes easily.

Modern cars will snitch you out. You need a few starts to be ready to test. Crafty bunch,

[Erni]

I just dealt with a CEL. You have a month after expiration to get new tags without a penalty. CO sucks as a CEL is automatically a failure. As they said find an on-ramp and do two tests in 6mo not sure how much prior to expiration you need to do them.
Yes after a reset most OBD2 cars need several cycles to verify all the systems.