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If the spark plug is fouled ("too rich" or in other words: Too much fuel, not enough air or spark to ignite): It is possible that the rich fuel will dirty up an O2 sensor, which may trigger a P0420 error.
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∙ 11y ago
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What can cause my 2000 Pontiac Grand Am SE 3.4L to get a P0420 CEL Code I replaced the cat both O2 sensor cleaned injectorsEGR worksreplaced fuel pressure relief and filter.Poor gas mileage.?
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