This are the steps for the Readiness Monitors that is the biggest PITA to complete~! NYS Allows one monitor to not be in a ready state to pass the Emissions Inspection.
IDLE TIME: Run engine (do not drive) for 2 1/2 minutes with the air conditioner on and rear defroster on. During this period the ECU will be running the Oxygen Sensor Heater self-test, Air Injection System Passive Air test, EVAP Purge "No Flow" test, Misfire Detection.
ACCELERATE: Turn off the air conditioner and rear defroster and begin driving. As soon as possible apply half throttle until 55mph is reached. The ECU will now run self-tests on the Misfire Detection, Fuel Trim, and EVAP Purge Flow.
HOLD STEADY: Now hold your speed steady at 55mph for three minutes. During this time the Oxygen Sensor O2 response, Air Intrusive (AIS System), EGR Flow, Purge Valve, Misfire Detection, and Fuel Trim diagnostics will be performed.
DECELERATE: During this step you want to slowly let off the accelerator pedal. Do not brake or shift in order to slow down (don't press the clutch if equipped). It is important to let the vehicle coast along gradually slowing down to 20 mph. The ECU will once again self-test the EGR System, EVAP Purge System and Long Term Fuel Trims.
ACCELERATE: Go ahead and accelerate again at 3/4 throttle until 55-60mph is reached. This will perform the same self tests as during the first acceleration step.
HOLD STEADY: Hold steady speed once again. This time at 55mph for five minutes. During this time, in addition to running the self-tests as during the first HOLD STEADY step, the ECU will perform the catalyst monitor diagnostics. If the catalyst (Catalytic Converter) is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst,or in order to Complete the CAT Monitor.
DECELERATE: This will perform the same diagnostics as in the first Deceleration. Remember not to press the brakes or shift gears (don't press the clutch if equipped).
Yep, readiness monitor sequences are fun. I used to do them for the shop I worked at all the time, some I'd print off because they had like 17 steps over 2-3 pages. Takes some creative driving at times and an immunity to honking.
I'll never forget the time I was setting readiness monitors and got pulled over. Well, slowly pulled over. Part of the test said I had to go from 55mph and naturally decelerate without braking until down to like 5mph, that's a long way to coast. So I did it on a state highway near the shop. As I dropped below speed for traffic I tripped the hazard flashers, drifted over to the shoulder and coasted all the way to an off ramp. I finally roll to a stop, cop pulls up next to me and rolls down his window. "What the hell are you doing?!" - with a straight face I said "setting readiness monitors". He goes WHAT?! (lmfao).. I was sitting in the vehicle in my uniform, held up the scan tool to show him and said 'readiness monitors'.
He was pissed, said not to do it again. I said where else am I supposed to do it? I have to get the car up to 55-60mph for several minutes, I could do that on backroads or residential but I don't think you'd be too keen on that either (30mph limit). Unfortunately my scanner was a cheapo, only around $230 for one of those LAUNCH obd book scanners. I mean it's handy but it's not bidirectional. Less cumbersome than one of the old snap on bricks or the modis or solus. But it did what I needed it to and it was capable of resetting the cel. That way I could leave one of the other techs with the modis and just use my scanner. And perk, it didn't cost me $8k plus updates.
The only issue I have with obd2 adapters and cell apps people often get, they get a generic code and everyone sells them or promotes them like 'save yourself the money when it's just a loose gas cap'. In the years I worked on cars, got evap codes - it was almost never the gas cap. lol. Interpreting the codes and knowing the systems they're tied to is a different ball of wax. I never got into deep diagnostics, the guy who owned the shop I worked at had been working on cars most of his life. Shop had been around like 20yrs, he started it from the ground up. I think he tried and failed his L1's 3 or 4 times that I know of. It's not an easy pass. A $50 app isn't going to tell someone exactly what's wrong and that's how they promote them.
Hopefully you got it this time, I know what a pain in the ass it can be. Luckily where I'm at there's safety inspections but because I live in a rural area, no emissions. Sometimes it's like chasing ghosts. One customer brought in a vw jetta that was in great running condition, but wouldn't pass cause of the cel. We replaced the O2's, catalytic converter. First with an aftermarket, then with a factory oem converter. Still no dice. Weeks of scratching our heads until we found out it was a computer issue. The parameters were out of whack and the tolerances so artificially tight, even a brand new oem converter wouldn't pass. Then fought with VW to get them to cover flashing the computer, they wanted to charge for their own faulty crap. Finally got it warrantied and a 30min reflash had the car passing flying colors.