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Mike V.
Mike V., Infiniti Mechanic
Category: Infiniti
Satisfied Customers: 25182
Experience:  Factory trained to repair Nissan and Subaru.
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Can non oem spark plugs cause a check engine light to go on

Customer Question

can non oem spark plugs cause a check engine light to go on and display a code that a coil pack is bad?
JA: Does the light stay on, or does it blink?
Customer: its a 1998 q45 and the lite is steady, i just replaced the knock sensors
JA: Are you fixing your Q45 yourself? What have you tried so far?
Customer: my son is a mechanic for the state and he just checked out the codes but no luck
JA: Anything else you want the mechanic to know before I connect you?
Customer: i cant get the car inspected with the check engine lite on
Submitted: 6 months ago.
Category: Infiniti
Expert:  Mike V. replied 6 months ago.

Thank you for your question!
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Expert:  Mike V. replied 6 months ago.

Yes, if you don't have nkg plugs in it, it can cause the check engine light to pop on.

However, I would also try swapping the coil on the cylinder that is misfiring with the one next to it and see if the misfire moves with it as well. If it does, then you will know the coil is no good.

Please let me know what more I can do to assist you today. Also, please be kind and remember to rate my answer, Just Answer does not compensate me for my time and resources. Follow up questions are included in the price of your question. If you are using the free trial, or have a subscription a rating is still required.
Thank you so much!

Customer: replied 6 months ago.
The car does not misfire it drives normal
Customer: replied 6 months ago.
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Expert:  Mike V. replied 6 months ago.

do you have a misfire code?

Customer: replied 6 months ago.
No I don't have a misfire code
Expert:  Mike V. replied 6 months ago.

Ok, I am confused, are you just wondering if this can happen then?