Log In
Register
Forums
General Mazda Forums
New Member Area
Off Topic
Sights N Sounds
Ride of the Month
Site Updates & Announcements
General Tech
Mazda Vehicles
Mazda Protege
Mazda2
Mazda3
Mazda5
Mazda6
Mazda MX-30 EV
Mazda CX-30
Mazda CX-3
Mazda CX-5
Mazda CX-7
Mazda CX-9
Mazda CX-50
Mazda CX-60
Mazda CX-90
Mazda Miata (MX-5)
Mazda MPV
Mazda Millenia
Mazda Tribute
Mazda 323,Mazda 626 & Mazda 929
Mazda MX-3 and Mazda MX-6
Mazda BT 50 & Pickup Trucks
Mazda RX-7
Mazda RX-8
Show Time
Detailing
Interior
Wheels, Tires and other Exterior
Audio/Visual Electronics
Brand Review
Intake, Headers and Exhaust
Electronics, Computer & Fuel Systems
Nitrous, Super Chargers, & Turbos
Suspension
Racing / Recreational
Street/Strip
Off Road
Professional Racing
Mazda Forum Sponsors
UltraRev
Vendor 'For Sale' Classifieds
Mazda Classifieds
the *new* Mazda Marketplace
OLD - PRIVATE For Sale / Trade Classifieds
OLD - Private 'Wanted' Classifieds
Other
Mazda Forum Help & Suggestion Center
Gallery
Tools
Car Payment Calculator
Tire Rim Calculator
Vin Decoder
Members List
Live Feed
Marketplace
Vendor Directory
Become a Vendor
The Mazda Marketplace
New Posts
View Dark Mode
Please register or login to enable Dark Mode.
Log In
Register
Threads
Google
Threads
Posts
Advanced
Mazda Forum - Mazda Enthusiast Forums
Log In
|
Register
Dark Mode
Please register or login to enable Dark Mode.
Contact Us
Manage Preferences
Archive
Advertising
Cookie Policy
Privacy Statement
Terms of Service
Your Privacy Choices
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 Facebook
Mazda Forum - Mazda Enthusiast Forums
Tags
Threads Tagged with
421
Community Links
Pictures & Albums
Members
Search Forums
Show Threads
Show Posts
Tag Search
Advanced Search
Go to Page...
Threads Tagged with
421
Thread / Thread Starter
Last Post
Replies
Views
Forum
2007 Mazda 3 Fuel Consumption
Tony3
on 12-12-2013
04-03-2021
11:25 PM
by
Alexcole
5
4,537
Mazda3
Question about 2012 Aftermarket
Ex.
on 03-04-2012
03-06-2012
05:25 PM
by
UseYourNoggin
7
2,106
Mazda3
Dick's 2002 millenia - OBD code 421
rwparha2
on 04-22-2011
04-22-2011
06:21 AM
by
rwparha2
0
2,656
Mazda Millenia
New Cat and o2 still get PO421 code
fast951
on 01-07-2009
01-08-2009
03:21 PM
by
darkstar4100
2
3,692
Mazda Protege
2000 Mazda 626 code 421
biggmac
on 09-03-2008
09-03-2008
02:27 AM
by
biggmac
0
1,796
Mazda 323,Mazda 626 & Mazda 929
header... 2.0
wireman3
on 03-30-2008
08-29-2008
06:12 PM
by
virgin1
8
2,462
Intake, Headers and Exhaust
asking about the obx header.
(
1
2
)
Danny0522
on 02-13-2008
02-18-2008
03:16 PM
by
Lupae3s
10
2,572
Mazda3
weapon r header
07silver6
on 11-21-2007
12-01-2007
05:18 PM
by
07silver6
4
1,579
Mazda6
CEL problem OBDII code: P0421
carsearch
on 04-19-2006
04-24-2006
09:06 PM
by
carsearch
6
8,340
Mazda 323,Mazda 626 & Mazda 929
All times are GMT -5. The time now is
09:17 AM
.