I wonder if your tune masks DTCs?
The tests are
catalyst
EVAP(7of them)
O2 sensor(12 of them)
O2 sensor heater(3 of them, run every time the key is turned on)

My computer is playing games with me or I would print out a pdf of the drive cycle article for 2008 LNF. I might have time later today.

 

Does your scanner show what is happening with the O2 sensors?

 

could you elaborate? like as in the voltage fluctuations?

 

Yes

 

i use either torque app or hptuners scanner. i went ahead and reflashed my stock tune. guess what? after 20miles of driving i got 3 of the 5 emission monitor readiness completed (knew from the start but didnt want to resort to reflashing back to stock tune). the 3 that got completed were the o2 sensor, o2 sensor heater, and egr. i only have the catalyst and evap left to complete or at least one of them so i can go get the car inspected. i imagine those 2 require a few more drive cycles before either one of them completes. i guess in the adjusted tune, something is affecting both the egr and o2 sensor heater from completing the tests. i'l have t go back and check what exactly they were but will be more time consuming.

 

Our HHR’s have an EGR valve?

 

they don't which is the odd part of the egr monitor completing on a stock file and not on the tuned file lol.

 

Yeah, that's weird. Here's what I see. The Red Xs show tests that are not applicable to this vehicle. HCAT, AIR, and EGR.

In California it is the EVAP that is not necessary for a smog check.

 

Hmm interesting . I use torque app to scan on the fly when not logging/ tuning Hptuners on a laptop. See below pic. After 3 key cycles and about 45 miles the catalyst went to complete so I'm good to go to get the car inspected and emission checked. I guess I'll have to do this method yearly.

 

Good to go! Thanks for the follow up.