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Car Tech forum: Diagnostic Puzzle

by: Kcrk79 January 10, 2012 2:27 AM PST

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Diagnostic Puzzle

by Kcrk79 - 1/10/12 2:27 AM












Hi all!



A mechanic told me
that my 00 Mirage has these 2 codes:







P0100 OBD-II Trouble
Code

Mass Air Flow
(MAF) Circuit Malfunction



A code P0100 may
mean that one or more of the following has happened:



The MAF may be
disconnected, or a wiring connection may be bad

The MAF sensor may
be faulty







P0421 OBD-II Trouble
Code

Warm Up Catalyst
Efficiency Below Threshold (Bank 1)



A code P0421 may
mean that one or more of the following has happened:



The catalytic
converter is no longer functioning properly

An oxygen sensor is
not reading (functioning) properly

A sparkplug is
fouled up







Do these 2 codes
together mean the catalytic convertor will probably need replacement?



Thanks for any
insight





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yikes

by Kcrk79 - 1/10/12 2:28 AM

In Reply to: Diagnostic Puzzle by Kcrk79

Wow, formatting came out terrible, I'm sorry about that


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Let me share my method.

by R. Proffitt Moderator - 1/10/12 11:29 AM

In Reply to: yikes by Kcrk79

When faced with many possible causes I put them on the list and then... fix the one that costs the least first.

This method has worked very well when I don't have prior experience with the product and the manual or diagnostic spews a list like yours.
Bob


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Thumbs up

by Kcrk79 - 1/10/12 11:55 AM

In Reply to: Let me share my method. by R. Proffitt Moderator

Great advice, thanks for the tip!


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