P0420

FYRECHILDE

MEMBER
2005 SATURN ION
2.2L
4 CYL
2WD
AUTOMATIC
156,000 MILES

Engine light came on. We get two codes, both showing P0420. Since this code came up twice, does this mean that the catalytic converter needs to be replaced? Or should I try replacing the downstream oxygen sensor first?

Saturday, March 12th, 2016 AT 10:21 AM

1 Reply

CJ MEDEVAC

MECHANIC
11,004 POSTS

THE EZist THING TO TRY IS RUN A FULL BOTTLE OF "SEAFOAM" IN YOUR GAS TANK. THIS WILL HURT NUTHIN' (EVEN IF IT DOES NOT WORK) BUT MANY TIMES THIS WILL FIX MANY O2 ISSUES.

HAVE YOU A LINK BELOW OF THE PRODUCT, OTHER STORES HAVE IT TOO

http://shop.advanceautoparts.com/p/sea-foam-motor-treatment-for-gas-and-diesel-engines-16-fl.-oz.-sf16/6410004-P?searchTerm=seafoam

LET US KNOW HOW IT GOES

THE MEDIC

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