try m3

Hey guys I had a quick question for you I have full turbo back downpipes and Eurocharged Stage 2 tune and cannot pass Illinois smog because I have 2 systems not ready Heated O2 sensor and Oxygen Sensor. In Illinois we can have 1 not ready and pass are you guys getting these same monitors not ready? I spoke to someone at Eurochaged houston and he said best bet is to flash back to stock but the problem with that is my CEL will come on from having no cats. I don't want to spend all that labor to remove my turbo back downpipes and put the stock ones back in.

try m3

Any of you guys have luck with o2 spacers? I'm thinking of adding those and flashing back to stock first.

timm206

https://www.fabspeed.com/universal-o...xoCFrgQAvD_BwE

Try these, some people have had positive experience with them. I personally never used them.

try m3

Awesome thanks I'll give them a shot. Anyone else with a tune and catless exhaust able to pass emissions/smog? I've never had a problem in my other cars that had the o2's turned off.

brfatal

In some cars you can force sensor readiness. Speaking with EC, it doesn't seem to be the case with these.

sunil517

The tuner mostly likely turn off the sensor when flashed so you do not see a CEL.
I had this issue when I had my OE tune added. I told them I do not want to have any or issues with CEL being on and I guess they took care of it. Until I went for inspection I saw those were set to "NOT READY"
I tried everything spacers, spacers with 90s, install a cat with POS piping NADA.. they have to re-flash and I passed with the CAT and then for fun I reinstalled my system and I was good to pass inspection with the 90 degree spacer but after like 100 miles I would get a CEl.

try m3

We're allowed one not ready to pass in Illinois and I'm getting 2 not ready monitors in this car for heated o2 and oxygen sensors. Which sucks all of my cars are catless and have no problem with just 1 not ready code.

try m3

Yea the o2 sensors are turned off to not trigger the CEL. I was told I would still pass emissions so I went ahead and did the full turbo back downpipes and bridge pipe had I known I would've just done the simple cat delete pipes. Man sounds like such a pain in the *** at this point I think I'll have to flash back to stock and then cut my stock cats out and have a custom section that bolts up to my turbo/bridge pipe. No way am I gonna spend 10-12 hours of labor to put the complete stock section back in then go to emissions then swap the turbo back pipes in again paying another 10-12 hours in labor. If I flash back to stock and use o2 spacers do you think I will pass after driving for 30 miles? Which spacers did you use?

sunil517

After inspection pull the cat install test pipe and you are good to go with your flash but you will have a CEL on all the time. The tuner will have to keep the O2s On.
I had Kleemann high flow but you can get some small 200 cell cats and install those with Vband.. this you can swap in a few hrs.
Different starts have diff requirements NY 1 not ready some states 2 not ready if you car is 2000 or older.
Do it once and get yourself test pipes and you will not no issues

try m3

My only concern is that the cats may be too far downstream, do you have turbo back downpipes as well? Also any pics of your setup, thanks for the help. This seems to be the most reasonable option I think.

sunil517

my issue was with 55 and NA63..I am sure these 5.5T are the same with locking out the O2s.
Try pair of those 90 degree O2 spacers and have the tuner turn on your 02s.

bentz69

This can all be corrected in the tune. The tuner likely wont do it unless they actually know you personally because it's illegal to tamper with emmsions systems. Huge fines if they get caught. But its 100% possible to code off specific readiness monitors with the MB Star directly or have it done with your tune file. GOOD LUCK

try m3

Talked to multiple tuners and MB techs all you can really do is turn off the secondary o2's to not trigger the CEL this will not help with passing emissions. There's no way to trick these ECU's into allowing the monitors to read ready (on M157 cars). If you turn off the secondary o2's you will have 2 not ready monitors 1 for o2 sensors and 1 for o2 heating circuit causing you to get a reject at smog/emissions. What can work is turn the secondary o2's back on throw on the right size o2 spacer and have the tuner broaden the heating range for your rear o2's.

brfatal

Does anyone know if the rear O2 sensor is just for emissions or if it's also used for fueling? If it's not just an emissions test device then spacers would be a bad idea.

try m3

Rear o2's are just for emissions primary o2's are what adjust and monitor AFR. Ended up getting the car to pass with o2 spacers and checking the monitors via obd2 iphone app.

ChiTownE63S

What type of O2 spacers did you use? Plan on getting mine tuned as well.. so i will be in the same boat

try m3

Get the vibrant J style spacer with the smallest restrictor you can buy it on amazon. If you're getting a tune DM me I've tried a couple of different tuners on this car will give you some feedback.

bentz69

Yes there is. Like I said, its illegal to do and unless the tuner actually knows you they will not do it for you. The tuner creates a "patch" which is essentially a tune that has skewed parameters and is coded to purposely NOT trigger CEL's. The patch is meant to be used only until the monitors go ready and will require whatever the drive cycle is for that particular car (xxx amount of miles etc). Then you get the inspection done and flash back to your regular tune. Oddly enough, the monitors will continue to be "complete" after you remove the patch and flash back to your tune. Monitors will reset only if you disconnect the battery or clear the codes.

So think about it....the typical cel you would get for having no cats and the rear o2s turned off does not trigger and eventually the monitor goes ready. And yes, it works for the m157.

Notice anything strange about the emissions patch pic vs the dyno tune? You see how the "fuel system" is ready? Not a typical monitor for these cars but the patch file allows it go complete. Patch file was loaded, drive cycle was completed and primary o2 monitors go ready. Inspection is done, flashed back to the dyno tune file, fuel system monitor doesn't exist anymore and the rear o2s are coded off.

Yes this is a m156 but it works for NUMEROUS benz platforms including m157. But im not here to debate it but rather to tell you that it does work. Good luck

greasycajun

I know this thread is old; however, does anyone think that the defouler/spacer would work on a 2018 C63 AMG? I have downpipes and a DME tune and have failed my inspection.

Any help would be appreciated.

Thanks in advance,

Cla4

Hey any update on your emissions? I am going to be in the same boat in illinois as well.

Cla4

Hey any update on your emissions problem? I am in illinois too and wanna figure something out.