[g82king]

I just got my downpipes installed, and my car is rattling and jolting from 0 to 1 rpm back and forth. I’m freaking out i don’t know what to do. Can someone please help me. I installed ARM Catless Downpipes on my G82 M4 Competition 2024. What do i do.

[GT_Juls]

Take it back to the shop? Shouldnt be rattling at all.

[GolfCoyote]

O2 sensor not get plugged back in? Only thing I can think that would do that and even then that seems unlikely

[SwankPeRFection]

This may not be possible due to the connections, but I’d make sure they didn’t mix up the O2 sensors between the primary and secondary ones. They are different… but you’d definitely get a CEL for something like that. Video would help see what you mean specifically.

[Info@mad-us.com]

O2 not plugged in or backwards are really the only things that can cause this.

If it was at a shop it should of never of left like this though.

[g82king]

Originally Posted by Info@mad-us.com

O2 not plugged in or backwards are really the only things that can cause this.

If it was at a shop it should of never of left like this though.

I know. "Drivetrain malfunction" error also comes up while im driving and the car goes into Limp mode.

[Info@mad-us.com]

Originally Posted by g82king

I know. "Drivetrain malfunction" error also comes up while im driving and the car goes into Limp mode.

Sounds about right. Good luck!

[Hit_Apex]

So many good s58 experienced shops in LA area too

[M3_V8_PWR]

Originally Posted by g82king

I know. "Drivetrain malfunction" error also comes up while im driving and the car goes into Limp mode.

They definitely must have gotten the O2 sensors mixed up…

What shop is this??

[Info@mad-us.com]

Originally Posted by M3_V8_PWR

They definitely must have gotten the O2 sensors mixed up…

What shop is this??

Seems to be a self installer. Our arch nemesis

[M3_V8_PWR]

Originally Posted by info@mad-us.com

seems to be a self installer. Our arch nemesis

🤭😂

[SwankPeRFection]

Originally Posted by Info@mad-us.com

Seems to be a self installer. Our arch nemesis

Then g82king ain’t much of a king then, huh? Thing that’s throwing me off is he said “I got my downpipes installed.”… didn’t say “I installed my downpipes and” which leads me to believe someone else did it for him. Maybe grammar is to blame here? 🤷*♂️

[Info@mad-us.com]

Originally Posted by SwankPeRFection

Then g82king ain’t much of a king then, huh? Thing that’s throwing me off is he said “I got my downpipes installed.”… didn’t say “I installed my downpipes and” which leads me to believe someone else did it for him. Maybe grammar is to blame here? ��*♂️

Maybe you are right. I was going by this

"I installed ARM Catless Downpipes on my G82 M4 Competition 2024."


I would hope a shop wouldn't have to resort to the customer reaching out for help on the forums for o2 wiring.

[markoz28]

Unplug everything being sure to disconnect negative battery terminal first. Trace every wire to the correct spot. Might be annoying because you may have to take off the bottom shield with its 40,000 bolts. Installing the downpipes is straight forward so the only issue would be wiring.

[Info@mad-us.com]

Originally Posted by markoz28

Unplug everything being sure to disconnect negative battery terminal first. Trace every wire to the correct spot. Might be annoying because you may have to take off the bottom shield with its 40,000 bolts. Installing the downpipes is straight forward so the only issue would be wiring.

Good advice! For anyone doing this for their first time please spend the extra 2 minutes and label your wires before removing.