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Recent questions tagged p0420

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indication of code PO420 on 2005 F150 5.4Lit. eng.
asked Aug 11, 2018 by
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1 answer 264 views
P0420 Buick - where should i start ?
asked Aug 10, 2018 by
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Help with this codes P0420, P0430
asked Aug 6, 2018 by Joseph18 (101 points)
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What exactly is Code P0420? (Low Catalyst Bank 1)
asked Aug 6, 2018 by
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2001 toyota sienna 420-440-446 codes
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P0420 Chevrolet -
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1996 ford mustang
asked Aug 3, 2018 by
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1 answer 477 views
P0420 - WOULOD THIS CAUSE MY CAR TO TURN OFF
asked Aug 3, 2018 by
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P0420 Nissan altima ( S1 or S2 fail)?
asked Aug 2, 2018 by
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P0174 02 Toyota Sienna What does this code mean?
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1 answer 678 views
Catalyst System Efficiency Below Threshold (Bank 1) chevy travse 2011
asked Aug 1, 2018 by
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1 answer 269 views
P0420 Cadillac -
asked Aug 1, 2018 by
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P0420 to P1491 now
asked Jul 30, 2018 by
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P0420 Toyota - avalon 2002
asked Jul 30, 2018 by
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1 answer 374 views
What should my next step be?
asked Jul 28, 2018 by
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1 answer 906 views
get 5 codes p0303,p0420,p0304,p0300,p1399
asked Jul 27, 2018 by
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P0420 Chrysler - Pacifica
asked Jul 27, 2018 by
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