[Lemke20]

Just got my VRSF downpipes installed the other day and was fine driving around for a few hours then got service engine soon light. I have MHD stage 1 tune and ran the codes and got these, 2C27 Lambda probe in front of catalytic converter system check, 2C6C Lambda probe behind catalytic converter 2 system check, 2C7F Lambda probe behind catalytic converter 2 trimm control, and 2DED power management, standby current control. Started getting a jerking thing happening when I touch the gas. Any ideas what it old be? Thanks.

[BSM n54iS]

I'm no expert....but I think it may be your downpipes!! You should be running the stage 2 tunes

And before you come back and ask why, whats the difference in the tunes etc etc....

[Lemke20]

Yeah I blew my money on the pipes so I gotta wait to get stage 2. Have done some searching and haven't gotten a clear answer so I thought I'd ask. Shouldn't have a problem running stage 1 though.

[Socaltrojan]

If the MHD does not clear the codes for you, then you need to get the DP fix cable, and once you add on DP you're already stage two in most cases. Your flash only is stage 1. I run Cobb stage 2 with DP only and that's a stage 2 sports option for standard map. Not familiar with MHD so not sure what their OTS for map set-ups are. I would look more into it if I were you and or get custom map done for it.

I attached pics of what cable looks like depending on N55 or N54 Engine DP's from VRSF

[STR8-6IX]

Originally Posted by Lemke20

Yeah I blew my money on the pipes so I gotta wait to get stage 2. Have done some searching and haven't gotten a clear answer so I thought I'd ask. Shouldn't have a problem running stage 1 though.

I cant believe how many times this is asked.

if you dont have money for the stage 2.. WAIT.

your air fuel mixture will be all over the place and the car wont run right. you need to tune it. like i tell everybody who asks this, either you do it properly, or dont do it at all.

[Blue E92]

I have catless dps as well as MHD stg 1 tune and don't have any issues with cel. You will still have codes for post cat sensors but only two and the cel will be disabled. Your issues may be something else I believe.
You should not be getting any codes regarding your front o2 sensors.

[E90Burgos]

The post cat codes should go away when you switch to Stage 2. The pre-cat codes are probably failing 02s, maybe they got damaged during the DP install. I got the same codes when I installed DPs. Replaced 02s and I was good.

Before anything I would clear codes and adaptations and see if it comes back, then go from there.

[Lemke20]

Thanks Blueee92 and E90Burgos for actually replying something helpful! We are going to go back under the car and make sure we got the 02 sensors in the right place in case we accidentally switched them up.