Discuss Jonathan's answer to: Check engine light

I have a 2004 Hyundai Elantra After the alternator failed and was replaced, I have a check engine light. P0420 error code. I changed both O2 sensors. I have disconnected the battery and reset the ...

Jonathan
Jonathan Answered:

yes you should check engne light as it indicates the quantity of oil in your engine.

engineering pdh

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