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Old 01-06-2010, 10:49 AM
michelle15214
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Thumbs down 05 nissan altima diagnostic code

I was informed today that I have a diagnostice code p0420 - catalyst efficiency below threshold (bank 1)...can someone explain to me exactly what this defines..went to shop and told I need to replace catalytic converter and two o2 sensors...is this true? if so, will it remedy problem...thanks for any assistance
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