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check engine light on 2000 Nissan Altima

my check engine light came on and I am not getting any codes from the scantool any help would be appreciated. I recently replaced the cap and rotor if that matters

Asked by for the 2000 Nissan Altima
Some scan tools have particular problems reading Nissan trouble codes. We have three scan tools where I work for this reason. Each tool has its strengths and weakness with each manufacturer but if a Check Engine Light is on there is a code stored in your car's computer. When replacing the distributor cap and rotor did you see the presence of oil in the distributor body? I have seen the distributor seal fail flooding the distributor with engine oil and I have seen distributors fail on this 2.4L engine. I would have to suggest using another scan tool.
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