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Recent questions tagged p0421

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0 answers 476 views
Failed smog check read error code P0421 but no check engine light.
asked Dec 21, 2018 by cdubg213 (101 points)
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2 answers 465 views
What does Catalysis Bank 1 P0421 mean on a 2002 Audi A6 Quatro?
asked Nov 16, 2018 by
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1 answer 775 views
P0421 Mitsubishi -
asked Oct 24, 2018 by
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1 answer 303 views
wP0421 Hyundai -where should I start?
asked Oct 22, 2018 by
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0 answers 423 views
P0431 Audi -
asked Aug 3, 2018 by
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1 answer 570 views
what do i need to do to get my car smogged ?.
asked Jul 23, 2018 by
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1 answer 680 views
P0421 Mitsubishi - 2.4L intermittant
asked Jun 29, 2018 by
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1 answer 415 views
P0421 - mazda
asked Jun 8, 2018 by
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1 answer 534 views
2002 VW New Beetle 1.8 t gas
asked Jun 7, 2018 by Tina (102 points)
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1 answer 680 views
how to repair obd2 scanner code po421 on 2004 Mitsubishi lancer
asked May 22, 2018 by
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1 answer 497 views
2006 Mitsubishi Lancer Oz rally P0421 fix
asked May 1, 2018 by
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1 answer 327 views
Any suggestions where to get a cheaper catalytic for '98 mitsubishi montero?
asked Apr 16, 2018 by
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1 answer 503 views
P0421 Mazda -
asked Mar 24, 2018 by
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1 answer 370 views
P0431 Mitsubishi -
asked Feb 15, 2018 by
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1 answer 498 views
I have the po431, and po421 codes showing on my reader.
asked Jan 3, 2018 by
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1 answer 405 views
P0421 Hyundai -
asked Dec 6, 2017 by
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