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Engine light on & off on 2002 Mazda 626

Tiny
INN2RITING
  • MEMBER
  • 2002 MAZDA 626
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
My check engine light has come on and gone off a few times. How do I know for certain if a catalytic converter is O2 sensor is needed. There is @ $300 difference I've been quoted and I want to be certain I'm not being taken.
Friday, December 10th, 2010 AT 1:35 AM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
What is the code number.
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Friday, December 10th, 2010 AT 1:47 AM
Tiny
INN2RITING
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  • 3 POSTS
The code is P0421
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Friday, December 10th, 2010 AT 1:51 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That would take a lot more detailed diagnosis to determine that for sure. That particular code is just a slow warm up code and not a catalyst efficiency code so the 0/2 signals would have to be examined closely to be sure. It is possible for them to be the problem. Ask the guy is he is going to guarantee his diagnosis.
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Friday, December 10th, 2010 AT 1:57 AM
Tiny
INN2RITING
  • MEMBER
  • 3 POSTS
They are recommending that both be replaced. I will ask about the guarantee. THANK YOU!
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Friday, December 10th, 2010 AT 2:00 AM

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