LOG IN
REGISTER
Forums
Getting Started
Site Announcements
New Members Check In!
MBWorld Featured Car of the Month Contest
Mercedes-Benz Hybrid / Electric Vehicles
CLA (EQ)
EQA
EQB (X243) SUV
EQC electric SUV
EQE (V295) Sedan
EQS
Mercedes-Benz AMG Vehicles
AMG Vendor Classifieds
A45, A35 AMG (W176, W177)
CLA 35, CLA 45 AMG (C117, C118)
C63, C43 AMG (W206)
C63s, C63 and C43 AMG (W205)
C63 AMG (W204)
C32 AMG, C55 AMG (W203)
C36 AMG, C43 AMG (W202)
CLK55 AMG, CLK63 AMG (W208, W209)
E55, E63, E53, E43 AMGs (W210, W211, W212, W213)
CLS63, CLS55, CLS53 AMG (C219, C218, C257)
S63 AMG, S63 AMG 4Matic, S65 AMG (W222, V222)
S63 AMG 4MATIC Coupe, S65 AMG Coupe (C217), Convert. (A217)
S55 AMG, S65 AMG , S63 AMG (W220, W221)
CL55 AMG, CL65 AMG, CL63 AMG (C215, C216)
SL55 AMG, SL63 AMG, SL65 AMG (R230)
SLS AMG Gullwing (C197, R197)
AMG GT: GT, GTS, GTC, GTR, GT-4door (C190 / R190)
AMG GT: GT, GTS, GTC, GTR, GT-4 door (C192 / R192)
SLK55 (R172)
SLK55 (R171)
SLK32 AMG (R170)
GLA45, GLA35 AMG (X156, H247)
GLC63s, GLC63, GLC43 AMG SUV and Coupe (X253, C253)
GLE63s, GLE63, GLE53 AMG SUV & Coupe (W166, W167)
GL63 AMG and GLS63 (X166, X167)
ML63 AMG (W166)
ML55 AMG, ML63 AMG (W163, W164)
G55 AMG (W463)
G63 AMG (W464)
R63 AMG (W251)
Mercedes-Benz Sedans
MB Sedan Vendor Classifieds
S-Class (W223)
S-Class (W222)
S-Class (W221)
S-Class (W220)
S-Class (W140)
S-Class (W126)
S-Class (W116)
E-Class (W214)
E-Class (W213)
E-Class (W212)
E-Class (W211)
E-Class (W210)
E-Class (W124)
E-Class (W123)
E-Class (W114/W115)
C-Class (W206)
C Class (W205)
C-Class (W204)
C-Class (W203)
C-Class (W202)
190E (W201)
B-Class (W245, W246)
A-class (W168, W169,W176,W177)
Mercedes-Benz Coupes & Cabriolets
MB Coupes & Cabriolets Vendor Classifieds
S/CL-Class (W140) Coupe
CL-Class (W215)
CL-Class (W216)
S-Class (C217) Coupe & (A217) Cabrio
CLS Coupe (C218)
CLS Coupe (C219)
CLS Coupe (C257)
C-Class Coupe (C204)
C-Class Coupe (C205)
CLK-Class (W209)
CLK-Class (W208)
E-Class Coupe (C207) & Cabrio (A207)
E-Class Coupe (C238) & Cabrio (A238)
CLA Coupe (C117)
CLA Coupe (C118)
CLE Class Coupe (C236) & Cabrio (A236)
Mercedes-Benz SLR & SL Roadsters
MB SLR & SL Roadsters Vendor Classifieds
SLR McLaren (C199)
SL-Class (R232)
SL-Class (R231)
SL-Class (R230)
SL-Class (R129)
SL/SLC-Class (R107)
SLK-Class (R172)
SLK-Class (R171)
SLK-Class (R170)
Mercedes-Benz SUVs, Trucks, Vans, Diesels, Other
MB SUVs, Trucks, Vans, Diesels Vendor Classfieds
G Class Electric (G580)
G Class (W465/W463A)
G Class (W460, W461, W463)
GL Class (X166)
GL Class (X164)
GLC Class (X254)
GLC Class (X253)
GLK-Class (X204)
M-Class (W166)
M-Class (W164)
M-Class (W163)
GLA Class (H247)
GLA Class (X156)
GLB Class (X247)
GLE Class (V167)
GLE Class (W166)
GLS Class (X167)
GLS Class (X166)
R-Class (W251)
Smart Car
Maybach (W240)
V-Class
Diesel Forum
X-Class
Classic, Vintage Mercedes-Benz Vehicles, Other Cars
Classic, Vintage MB Vehicles Vendor Classifieds
Vintage Mercedes-Benz Owner Registry
General Discussion of Mercedes-Benz Classics
Classic Mercedes DIY tips and hints
Other Cars
Technical & Vehicle Assistance Forums
Technical Assistance Vendor Classifieds
Mercedes Tech Talk
Wheels, Tires, Suspension & Brakes Forum
Audio & Electronics
Performance Upgrades & Tuning
Detailing & Automotive Care
Automotive Leasing & Financing
Extended Warranty Discussions
European Delivery of Your New Car
Vendor Market Place
Vendor Announcements
Vendor Specials
Vendor Group Buys
Vendor Classifieds
General Forums
General Mercedes Discussion
Safety & Testimonials
Marketplace
Collectibles, Models and Literature
Newsletter Archive
Mercedes-Benz Motorsports & Racing
Events & Gatherings
Kill Stories
Lifestyle
Regional areas
US
Asia-Oceania
Canada
Europe
Middle East
Site & Forum Support
Suggestions & Feedback
Questions about how MBWorld.org works...not for car questions.
Test
News
Marketplace
Mercedes AMG Cars For Sale
Mercedes Wheels and Tires For Sale
Mercedes AMG Wheels and Tires For Sale
Vendor Directory
Become a Vendor
Site Store
Marketplace
New Posts
Tools
Car Payment Calculator
Tire Rim Calculator
Vin Decoder
Recalls
Technical Service Bulletins (TSBs)
Members List
Live Feed
How-Tos
Gallery
About
View Dark Mode
Please register or login to enable Dark Mode.
Log In
Register
Threads
Google
Threads
Posts
Advanced
MBWorld.org Forums
Log In
|
Register
Dark Mode
Please register or login to enable Dark Mode.
Contact Us
About Us
Your Privacy Choices
Manage Preferences
Archive
Advertising
Cookie Policy
Privacy Statement
Terms of Service
Affiliate Disclosure
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
×
Log In
Forgot your Password?
By logging into your account, you agree to our
Terms of Use
and
Privacy Policy
, and to the use of cookies as described therein.
or
Login with Google
Login with Facebook
MBWorld.org Forums
Tags
Threads Tagged with
p0420
Community Links
Pictures & Albums
Members
Search Forums
Show Threads
Show Posts
Tag Search
Advanced Search
Find All Liked Posts
Go to Page...
Threads Tagged with
p0420
Thread / Thread Starter
Last Post
Replies
Views
Forum
Got aftermarket CAT - now check engine light!
wysocki
on Jul 6, 2010
Oct 25, 2025
10:29 PM
by
C230 Sport Coup
18
8,899
CLK-Class (W208)
CEL-P0420 Catalyst Efficiency Below Threshold-HELP!
Babybenzc230
on Nov 5, 2011
Mar 1, 2021
08:51 PM
by
Anthony Ochs
16
32,603
C-Class (W203)
Error Code P0420
Koru_Kinshi
on Jan 25, 2014
Jan 27, 2014
04:41 AM
by
mohd.awaly
1
4,335
Mercedes Tech Talk
P0420 so I put a O2 Non-Fouler spacer. MPG better?
J_STATUS
on Oct 30, 2013
Oct 30, 2013
07:23 PM
by
J_STATUS
0
1,299
C-Class (W203)
c240's catalytic converter
(
1
2
)
sinaa
on Jul 23, 2010
Sep 4, 2013
01:19 PM
by
Krew876
31
25,489
C-Class (W203)
Solution for P0420 on Kleemann cat
Utahkompressor
on Sep 3, 2012
Sep 5, 2012
12:50 AM
by
Utahkompressor
4
4,408
C-Class (W203)
Anybody got CEL because kleemann header?(M271)
(
1
2
3
)
Utahkompressor
on Apr 25, 2009
Feb 16, 2012
08:02 PM
by
Glyn M Ruck
72
19,372
C-Class (W203)
rattle
sammydragon3
on Sep 23, 2011
Sep 23, 2011
06:09 PM
by
sammydragon3
2
1,276
C-Class (W203)
P0420 with Kleemann cat again!
Utahkompressor
on Aug 2, 2011
Aug 3, 2011
01:49 AM
by
Utahkompressor
2
1,946
C-Class (W203)
Catylytic Converter Replace
Smokphattys
on Mar 7, 2011
Jun 29, 2011
08:04 PM
by
amanonfire
23
5,397
C-Class (W203)
DTC Codes P0410, P0420, P0246
C230Krarana
on Mar 18, 2009
Feb 3, 2010
10:12 PM
by
ps888
5
7,624
Mercedes Tech Talk
Possible problem with my 271 engine?
capt_paul
on Apr 9, 2009
Apr 12, 2009
05:55 PM
by
LILBENZ230
5
1,739
C-Class (W203)
P0237 and P0420 codes
capt_paul
on May 8, 2008
May 8, 2008
10:48 PM
by
capt_paul
2
3,595
C-Class (W203)
P0420 and P0237 Codes 2005 c230
capt_paul
on May 8, 2008
May 8, 2008
07:42 PM
by
capt_paul
0
4,794
Mercedes Tech Talk
All times are GMT -4. The time now is
06:54 AM
.