2001 Mazda Millenia Check Engine Light Assistance

DYNASTYDEL

MEMBER
2001 MAZDA MILLENIA
6 CYL
FWD
AUTOMATIC
82,500 MILES

I have a 01 Mazda Millenia 2.5L and have a check engine light on again. Before I had check engine light codes P0170 and P1522 and I bought two oxygen sensors bank 1 and bank 2 from Denso direct fit. Had a mechanic put them in. Now my check engine light is back on again almost 500 miles later. The check engine light codes are P0421 and P0431and P1522. I have been going through this check engine light stuff for the last year please someone solve my problem.

3 Replies

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Hello and thanks for the donation!

The first two codes (0421 and 0431) are oxygen sensor fault codes, however, since you state you had them replaced recently it is most likely a faulty catalytic converter causing these codes to appear. Code 1522 is a transmission fault code and refers to the variable resonance induction system (VRIS) solenoid valve #2 circuit malfunction.

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Saturday, December 5th, 2009 AT 10:36 PM

DYNASTYDEL

MEMBER
6 POSTS

Thanks how will I know which catalytic converter is bad? I don't want to pay an auto shop 100 dollars just to find out which one. By those codes is there anyway to tell? Is it the front one or the rear catalytic converter? Also does it have to be direct fit or universal? Or is it better to just have direct fit? Is it possible I could get one from another mazda millenia? Or does it have to be brand new? Please let me know thanks

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Sunday, December 6th, 2009 AT 4:07 AM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

You can get a used one from a salvage yard as long as its for your specific vehicle. I recommend direct fit if buying new, not a universal one. Can't tell which one from the codes, the converters will need to be flow tested to show which is faulty.

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Sunday, December 6th, 2009 AT 11:30 AM