Its the O2 + cat temps checking I guess based on drive cycles for ECU to complete its tests. One of them can be incomplete like Evap.. Catalyst and evap are the last ones, but most of the time Catalyst monitor completes before evap... Evap takes the longest.

DIY readiness monitors pre-check before a smog check

It was time for another SoCal renewal. Smog check would have failed if I had taken in the car yesterday. I had a scanner and I did not hook it up thinking everything was fine. As I got closer to the station and I hooked it up. 2 monitors were INC: Catalyst monitor, Evap monitor. I told them that...

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Follow the drive cycle stuff ^^ and should be complete. Normally, daily driving with gas tank between 1/4 - 3/4 should be good for all tests. Never full tank.

And any CEL cleared also resets the monitors. So you have to make sure to check before going for testing. Some will tell you but some still do the test to fail you and give discount on retest. Make sure you do not do anything that requires a CEL reset at least a couple days before testing.

 

Catalyst and evap are the last ones, but most of the time Catalyst monitor completes before evap... Evap takes the longest.

Evap is complete as per the report in OP, but catalyst is not.

Follow the drive cycle stuff ^^ and should be complete. Normally, daily driving with gas tank between 1/4 - 3/4 should be good for all tests. Never full tank.

I filled the gas tank right after the repair. 😣 Now I know. Also haven't driven on highway yet. Both of these conditions should be satisfied this weekend, so hopefully it will be good to go after that, thanks!

 

Brought vehicle in for inspection with 'Catalyst' test still showing incomplete, and passed emissions, so that confirms that in NY state, one smog readiness test can be incomplete and you can still pass.

 

Same across the pond in the UK 🇬🇧

Passes every time with some tests showing incomplete. Just make sure to clear any engine codes before the test.

Once I got a P0420 engine code - Catalyst system efficiency below threshold (Bank 1). Seafoam wasn’t recommended so I used a catalytic converter cleaner and a petrol system cleaner, on a quarter tank and ran it hard on the highway. It “cleared” up any clogs and the car wasn’t sluggish anymore. Passed emissions with flying colours