E55 P0422 & P0432 efficiency below threshold
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 17
Likes: 0
From: California
2005 E55 AMG, 1988 420 SEL, 2000 S500
E55 P0422 & P0432 efficiency below threshold
So I've had these codes for a while. Never cared to fix them but since i'm in the process of getting everything fixed best Id ask the experts.
*I'm running no mufflers and no secondary cats along with that I have a Burble tune* Do you guys think I just have the o2 sensors burnt out? I think e55s have 4 if i'm not mistaken so probably the first ones on each side?
What o2 sensors do you reccomend? easy to change?
*I'm running no mufflers and no secondary cats along with that I have a Burble tune* Do you guys think I just have the o2 sensors burnt out? I think e55s have 4 if i'm not mistaken so probably the first ones on each side?
What o2 sensors do you reccomend? easy to change?
Super Member
Joined: Nov 2004
Posts: 687
Likes: 26
From: So Cal
07 GL450, 91 NSX, 12 Prius
I am having the same codes. P0422 P0432 on my 2006 CLS55
Hoping the clear the code:
I had exhaust leak issues before which was fixed. With New OEM exhaust Manifolds. cost almost $2000. Still getting CEL.
O2 sensors are only 20000mi old w Denso replacements
I have the Race IQ tune + Pops and Bang on Stock SC pulley
What should be my course to repair and Clear the codes.
load stock tune back in? although RaceIQ tune on my SL55 never generated codes.
Change out 02 sensors again?
Get new replacement Cats? Im in cali so this option is nuclear to me!! This will completely blows my budget - Can I use direct fit Fed - cat replacements if I get them into Cali somehow? I can install it myself if they are direct bolt on replacements.
Thanks .
Hoping the clear the code:
I had exhaust leak issues before which was fixed. With New OEM exhaust Manifolds. cost almost $2000. Still getting CEL.
O2 sensors are only 20000mi old w Denso replacements
I have the Race IQ tune + Pops and Bang on Stock SC pulley
What should be my course to repair and Clear the codes.
load stock tune back in? although RaceIQ tune on my SL55 never generated codes.
Change out 02 sensors again?
Get new replacement Cats? Im in cali so this option is nuclear to me!! This will completely blows my budget - Can I use direct fit Fed - cat replacements if I get them into Cali somehow? I can install it myself if they are direct bolt on replacements.
Thanks .
Member
Joined: Nov 2020
Posts: 162
Likes: 15
'03 S55 AMG / '09 E550 4-Matic / '08 E350 4-Matic
I am having the same codes. P0422 P0432 on my 2006 CLS55
Hoping the clear the code:
I had exhaust leak issues before which was fixed. With New OEM exhaust Manifolds. cost almost $2000. Still getting CEL.
O2 sensors are only 20000mi old w Denso replacements
I have the Race IQ tune + Pops and Bang on Stock SC pulley
What should be my course to repair and Clear the codes.
load stock tune back in? although RaceIQ tune on my SL55 never generated codes.
Change out 02 sensors again?
Get new replacement Cats? Im in cali so this option is nuclear to me!! This will completely blows my budget - Can I use direct fit Fed - cat replacements if I get them into Cali somehow? I can install it myself if they are direct bolt on replacements.
Thanks .
Hoping the clear the code:
I had exhaust leak issues before which was fixed. With New OEM exhaust Manifolds. cost almost $2000. Still getting CEL.
O2 sensors are only 20000mi old w Denso replacements
I have the Race IQ tune + Pops and Bang on Stock SC pulley
What should be my course to repair and Clear the codes.
load stock tune back in? although RaceIQ tune on my SL55 never generated codes.
Change out 02 sensors again?
Get new replacement Cats? Im in cali so this option is nuclear to me!! This will completely blows my budget - Can I use direct fit Fed - cat replacements if I get them into Cali somehow? I can install it myself if they are direct bolt on replacements.
Thanks .
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,965
Likes: 1,315
From: Republic of Texas
'99 and '05 E55 AMG
Pops and bangs mean you are dumping raw unburned fuel into the exhaust; of course it is going to throw codes. Excess fuel dumped into the exhaust can literally melt the catalytic convertor cores. You can have a high-performance tune without the "pops and bangs". And with fewer issues.
Yes, I have a tune. No, it does not have "pops and burbles". My O2 sensors and catalytic convertors have almost 240,000 miles and 20 years on them with no codes. So...I would infer it is your tune that is causing the issues.
Before changing out the O2 sensors, try taking a look at the live data from them. Front sensors should show varying voltage, rear sensors should show virtually steady voltage.
Yes, I have a tune. No, it does not have "pops and burbles". My O2 sensors and catalytic convertors have almost 240,000 miles and 20 years on them with no codes. So...I would infer it is your tune that is causing the issues.
Before changing out the O2 sensors, try taking a look at the live data from them. Front sensors should show varying voltage, rear sensors should show virtually steady voltage.
Last edited by bbirdwell; Nov 2, 2024 at 07:49 AM.
