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2001 Mazda Protege P0421

Tiny
GUAYAS007
  • MEMBER
  • 2001 MAZDA PROTEGE
  • 144,000 MILES
Mil on, went to check for code, it show p0421, last year replaced cat. Coil packs, and cables +sparks, found different code and I replaced all this parts per dealer. And now this code? Another cat?
Thursday, September 19th, 2013 AT 8:52 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I kinda doubt it is the cat if it was replaced last year unless you put a ton of miles on it. But it cold be a bad O2 sensor, and exhaust leak out of the O2 either front or back of cat or an exhaust leak
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Thursday, September 19th, 2013 AT 9:32 AM
Tiny
GUAYAS007
  • MEMBER
  • 2 POSTS
Thanks for this info, I will check this weekend. :)
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Friday, September 20th, 2013 AT 8:27 AM

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