I bought my car from a state the doesn't have inspections and it had codes p013a and p013e so i turned those off with the trifecta software and the CEL hasn't come back. Yet it failed the inspection this morning. The paperwork says it passed on o2 sensor heater, catalytic converter, and EGR but it failed o2 sensor and evap system. I have a catted dp, catback, K&N SRI, forge bpv, and trifecta tune. I'm wondering if I need to turn off more codes or just drive it longer and hope it clears, but with no light on idk how to tell if it will pass.

 

Turning off codes in this car causes the emissions diagnostics to report as "not ready", which is a fail. You ultimately need to fix whatever's causing your codes in order to pass. Most code readers will also report on your diagnostics so you can tell if your car will pass before you take it there. If you have an Android phone, download the Torque app and buy a $15 bluetooth OBD transmitter off Newegg or Amazon and you're golden.

 

Are you sure about codes being turned off making it fail? And I have no idea how to make the evap system pass when nothing is wrong with it.

 

Yea the diagnostic tool in HPT tells u if u pass or fail.

I know ur using trifecta but im jus puttin my two cents in here for ya.



A friend of mine had trouble with his car ... We had to turn off all the evap and associated codes with it so it would pass inspection. There were a bunch.

 

Evap is a bitch and needs a very specific set of criteria before it will show ready. That said, I think almost every emissions place will pass you with with up to 1 parameter (such as evap) showing not ready. Mine wasn't ready when I passed. Focus on getting all of your other codes to show ready and worry about evap last.

 

Makes me wish I had hpt. Lol. I'm not sure what to do to get rid of those codes since I already have a cat. I'll have to find out if they'll pass me with one not ready.

 

Catted pipes have been known to throw codes in the past. If you still have the stock DP I suggest swapping it out, resetting your codes, and driving for a few days to let all systems test ready (except evap which will probably still be waiting), and once you can confirm readiness via HPT or some other scanning tool go get it tested. If you swap to a stock DP and still have issues, you may consider replacing your downstream o2. Also check for exhaust leaks...on the unlikely chance you have a leak in the system before that o2 sensor, it might be responsible. But I'm placing my bet on your high-flow cat.

 

Yeah I have the stock one it's just not enticing to go through that hassle to pass if I can manipulate the codes to pass. But I guess I might have to. Do you guys know if flashing a new tune would reset it to where I'd have to drive more to pass?

 

Highly unlikely. As said before, if you tune the code out, the diagnostic will cycle will never complete. You will have no CEL, but in checking the readiness codes, it will always show "not ready". If you do not tune it out, the diagnostics will run and most likely you will pop the code again and get a CEL. The ECU isn't like the older GM cars where you can force it to read ok (like I did in my wife's old Cavalier )

It's only about an hour to swap the pipe out (do it a couple times and you'll quickly become an expert). Two hours of work every 2 years is a small price to pay in my book for some extra driving excitement. But nonetheless it is the price you pay in this particular car.

 

Is it certain codes that will not cause it to complete? I realized I have p013a and p013e plus p0420 off. I was wondering if I turned p0420 back on if that would let it complete the o2 monitor.

 

what year car do you have? And since you have trifecta and hopefully you have the cable and the ezflash program. If you do, you can turn off monitors through ezflash and they will be set to not supported (It will not notify anyone). If you open ezflash, go to "Program" then to "Adjust tune setting" then to "OBD2 DTCs & Readiness monitors" and turn off the monitors you are failing.

I have done this the last 2 years in NY and have not had an issue yet as long as your check engine light is not on.

 

If Trifecta can trick the ECU into passing then that's the way to go. I know that HPT cannot do this. Does your emissions testing plug anything into the OBD port or just do a visual check for a CEL?

 

His state would have to plug into the OBD port just like NY or else they wont be able to read the monitors. HE also stated that his CEL isnt on. I wish they didnt plug into the OBD port, it make things a hell of a lot easier to pass lol. Reset the batt and go straight to the inspection station and itd pass, BUT we arent that lucky anymore.

 

The thing is, for states that read via OBD, no CEL doesn't necessarily mean a pass. As I've been saying, if you simply disable the P420 code in the LNF (dunno about LSJ), the OBD diagnostic will simply always say not ready. This means no CEL and when emissions scans it, it also means no pass. Believe me, I learned the hard way in getting my car to pass last year.

 

Yes, I completely agree with you on the CEL. But disabling the CEL will not let your monitor read as ready. Going through Trifecta and disabling the montiors regarding the O2 sensor will allow the car to pass and as long as the P0420 is turned off as well as his other codes that are popping up, he will not throw a check engine light.

 

Well if Trifecta has that ability then his problems are solved. Just disable the other codes he's throwing and he should pass. The codes are just related to the catted pipe anyway and don't affect anything else on the car.

 

Trifecta def has the ability. I had the same issue as you disabling the p0420 and still not having the O2 sensor read as "ready" as well as the heater the first year i had a catless downpipe. Then the folowing year trifecta came out with the DTC and monitor readines and i messed around with them til it passed and the car pass without a reset of the battery and with a catless downpipe on it.

 

Thanks for all the responses guys. I'm gonna give the whole turning off the readiness monitors thing a try. I figure start with the simplest possibility first. My friend has a thing that should tell me if my monitors will pass or not so I'm having him check it till it passes lol.

 

Reviving an old thread here, moved to a state that has emissions, but recently got some codes related to secondary O2 heater or something along those lines. Asked around, people said it won't affect anything if I'm catless. Did you get to pass your inspection?

 

if ur having heater codes on ur o2, its most likely shot, get new sensor, turn on the codes. that secondary o2 is a pain in the ass. I have never seen one last on my car for more than half a year. im catless and in a place where the temp can change by like 20+ degrees over night, so most of the sensor going bad issues stem from moister buildup in the sensor. even with codes off my car still stumbles at startup when the sensor is bad. but I think I will fix that and just totally unplug it with codes erased.