2007CalSpec

Hey guys, I've been driving with high flow cats for about 2 weeks and just had a smog check done this morning and it failed some OBDII monitors. I'm not really surprised but I thought I would pass since I had no check engine lights. I figured if there were no check engine lights then the car should pass. I was wrong. Has anyone had this issue with high flow cats? The rear O2 sensors are mounted further down on the horizontal section before the x-pipe and not on the cats themselves like the OEM units. Is it possible the rear O2 sensors are not getting hot enough because they're not mounted on the cats where they can get hotter? Also, I'm not sure why the evap system isn't ready. Is it because my fuel level was a little more than 1/4 full? I'm going to put my OEM cats back on for the next test. Should only take me 1-2 hrs. Thanks!

Funny thing is they passed me on visual for the cats. lol

2007CalSpec

Update: I think I may have fixed the issue. I won't know until I do a drive cycle. Sensor 2 bank 1, and sensor 2 bank 2 had no readings when I hooked up my OBDII scanner. I wasn't getting anything from them. These are the rear O2 sensors. I think I may have been using my other "91 Street" custom tune with rear O2 sensors turned off. DOH! LOL

I reflashed with my 91 emissions tune and now I'm getting readings from the rear O2 sensors. As for the evap monitor not being ready, I think I just need to make sure I have at least 1/2 to 3/4 tank full before doing a smog check. At least that's what most sites recommend on that issue.

1 Alibi 2

My 11 threw codes with high flow cats. ( Kooks )
Currently running Kooks " green " cats, no codes & passes N.J. inspection without doing anything to the tune.
.

2007CalSpec

Mine hasn't thrown any codes in over 2 weeks of driving with the high flows on. I took the downpipe legs of my old O/R prochamber and had a shop weld the high flow cats on. I can swap out my high flow cats with my OEM cats if I really need to. You just pull off the catted downpipes and put the other ones in its place. It's really easy but just inconvenient. It's more convenient to be able to pass with the high flows on.

These are the HF cats I have...
http://www.ebay.com/itm/271300995155...xe=exe,ext=ext

Anyway, I did a drive cycle this morning; following this procedure.
http://www.obdii.com/drivecycleford.html

I was kinda worried because it wasn't until I returned home and parked my car in the garage with the car idling that the catalyst monitor finally went "complete". Woohoo! Now I just need to have the evap monitor go "complete".

EDIT: I just did a search for how many monitors you can have "incomplete" to pass in California. I think I'm good to go!

Excerpt from:

Department of Consumer Affairs
Bureau of Automotive Repair
OBD Criteria / Readiness Monitors
October 20, 2016

Gasoline Vehicle Standards
BUREAU OF AUTOMOTIVE REPAIR
• Number of incomplete monitors allowed to pass on gasoline
powered vehicles:
– Old standard: any two for 1996 to 2000 model years
– New standard: any one for 1996 to 1999 (BAR-97 test)
– Old standard: any one for 2001 & newer model years
– New standard: only evap. for 2000 & newer (BAR-OIS test)

2007CalSpec

I had a retest done this morning and I passed this time. With high flow cats. In California.

ricky87gtz

Hello there!

Same problem here.

I have a 2012 Mustang GT and I have a JLT CAI. This is the first year California asks for a smog on my car.

I returned to stock and added a strategy tune for the CAI only to avoid the P0174 code.

I was able to get all sensors including EVAP ready EXCEPT the O2 sensor and O2 sensor heater. I already drove the car over 100 miles and it's still a no go.

I tried the suggested steps below a couple of times.

1. Oxygen Sensor Drive Cycles - The following are some sample drive cycle requirements for the oxygen sensor monitor to run:
Ford: The monitor should run when the engine has reached normal operating temperature, the inlet air temperature is between 40 and 100 degrees F, and the vehicle is cruising at a steady 40 mph for four minutes.

2. (same thing from a different site)
HEGO - Cruise at 64 Km/h (40 MPH) for up to 4 minutes. - Executes the HEGO monitor.

Have you heard any other CA mustang owners successfully getting the O2 sensor ready and passing the smog with an aftermarket CAI installed?

I also have Flowmaster mufflers. Is it possible that this is causing the O2 sensors to not be ready?

I saw a few posts from CA mustang owners that they were able to get the sensors ready and passed the smog but for older mustangs. See link below.

mustangforums.com/forum/gt-s197-general-discussion/571429-smog-check-in-ca-with-tune-and-or-cai.html#post6611205

Any pointers on this would be greatly appreciated.

Thank you,

danzcool

I'd give it a little more time and drive it in traffic & open road, but the strategy tune *might* turn off the rear O2 sensors.
The easiest fix if the rear
O2's are off is to swap back in the stock airbox & tube, then return the tune to stock, give it some time til all sensors are ready, go get you smog done, then put it back to your mods and tune. Otherwise you could order up an "emissions tune" from your online tuner of choice.

ricky87gtz

I'll try driving it some more tomorrow. I do have the OEM airbox in case it keeps giving trouble. I was hoping for an option to keep the JLT CAI in.

One other thing I noticed is that the voltage will stay at .9 most of the time. Not sure if it's just the Torque app not updating properly.

Thank you danzcool!