Engine Check Light

Reply Subscribe

Thread Tools

Search this Thread

January-24th-2003, 05:17 PM

mesx7828

Registered User

Thread Starter

Join Date: Oct 2002

Location: panama city

Posts: 96

Engine Check Light

Can anyone help me, I got a engine check light. went to autozone and had the code check. Got a Code:

P0421
warm-up Calalyst efficiency below threshold (bank 1)

Can anyone help me, with this? Can i fix it myself. Mazda dealer no help.

January-24th-2003, 05:24 PM

TheMAN

Protege Anarchist

Join Date: Sep 2001

Location: Dallas, TX

Posts: 708

check for exhaust leaks

if that is fine then any of the two O2 sensors are bad

January-24th-2003, 06:03 PM

mesx7828

Registered User

Thread Starter

Join Date: Oct 2002

Location: panama city

Posts: 96

when you say exhaust you mean muffler? And if its not the exhaust and 02 sensor is it hard to replace myself?

January-24th-2003, 06:14 PM

midnightblue97

Salt addict

Join Date: Aug 2002

Location: Niagara Falls Ont.

Posts: 1,201

midnightblue97 is on a distinguished road

Quote:

Originally posted by mesx7828
when you say exhaust you mean muffler? And if its not the exhaust and 02 sensor is it hard to replace myself?

He probably means anywhere from exhaust manifold to tailpipe.

Reply Subscribe

Related Topics

Thread

Thread Starter

Forum

Replies

Last Post

2006 Mazda 3 5 Door: AT Warning Light on: Check Engine Light on

David2006Mazda3

Mazda3/Mazdaspeed3

December-17th-2014 01:26 AM

05 Mazda 3 AT Light and Check Engine Light

MrCardinal

Mazda3/Mazdaspeed3

March-27th-2014 05:27 PM

check engine light and the battery light

patel0516

Mazda3/Mazdaspeed3

May-23rd-2007 07:27 PM

Battery Light, Check Engine Light, Came on with new intake??? What Do I do??

hotprotege2002

3rd gen Engine/Drivetrain

April-10th-2003 04:50 PM

Anyone know how to check the code for the check engine light?

EXavier

2nd gen Engine/Drivetrain

July-31st-2002 04:31 PM