P0420

2005 SATURN ION
156,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
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FYRECHILDE
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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?
Mar 12, 2016 at 10:21 AM
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CJ MEDEVAC
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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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Mar 12, 2016 at 4:36 PM