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3rd Gen Protege/MazdaSpeed/P5/MP3 General/Maintenance Discussion for 1999-2003.5 Models Only (BJ Chassis)

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Old February-19th-2006, 10:30 AM   #1
minihaha
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Engine code PO421

My 2002 Pro5 Check engine light has come on and the car has a definite loss of power.
Went to Autozone and they came up with Engine code PO421 -"warm up catalyst below threshold"
He then tried to sell me a new O2 sensor for $250.
Any help or ideas?
Thanks, Pat
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Old February-19th-2006, 10:49 AM   #2
Mazdacub
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It could be the same code I just had but I am not sure. Mazda hase a 120,000km 8yr or is it a 128,000km 8yr emissions warranty. My cat is being replaced because the code I just got saying the second O2 sensor was getting a inconsistent reading. Go check out the dealer first and don’t let them tell you they will still charge you for pulling the code. I had a huge fight with my dealer about this because I feel if the code is from a warranty issue I should not have to pay….and I won!!!!!
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Old March-3rd-2006, 07:43 PM   #3
mp5wgn
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warranty

Quote:
Originally Posted by Mazdacub
It could be the same code I just had but I am not sure. Mazda hase a 120,000km 8yr or is it a 128,000km 8yr emissions warranty. My cat is being replaced because the code I just got saying the second O2 sensor was getting a inconsistent reading. Go check out the dealer first and don’t let them tell you they will still charge you for pulling the code. I had a huge fight with my dealer about this because I feel if the code is from a warranty issue I should not have to pay….and I won!!!!!


yo, just going through the forum to try and solve my problem. my O2 sensor went bad and wether i change the one after or before the catalyc converter, they are about $200 each. so my question to your thread is, you are saying that the emission warranty is for 8 years - 120, 000 km but all my factory warranties experied already, can i still get this one? i really dont want to spend all that money on a tiny *** sensor. please get back to me, thanks
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Old March-3rd-2006, 09:11 PM   #4
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P0421 simply means the first O2 is too close the reading of the second O2. Changing the sensor would be like shooting the 6 o'clock news guy when he is just reporting.

You need a new convertor. The parts and labor are covered for 8 yrs and 80,000 miles.
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Old March-4th-2006, 09:04 AM   #5
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Quote:
Originally Posted by snap-on
The parts and labor are covered for 8 yrs and 80,000 miles.
Exactly. This is a government regulation relating to emissions standards. ALL cars sold in the US are required to meet the 8 yr, 80,000 mi requirement.
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Old March-4th-2006, 09:04 AM
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04mazda3, 09, 2002, auto, check, code, codes, emmisions, engine, innova, light, losing, mazda, p0421, po421, power, protege, zone


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