Chevrolet Suburban P Codes (Powertrain) P0400 - P0499 P0420

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P0420 Engine Code

CHEVROLET SUBURBAN
My '98 Suburban, 5.7l, 4sp Auto, 4wd And 176,000 Miles Is Giving The Subject Code Indicating "catalyst Efficiency Below Normal (bank 1)"....
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Asked by caddiac

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