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Toyota Service
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Lexus ES300: I have a 1999 Lexus es300 with error codes p0300

Customer Question

I have a 1999 Lexus es300 with error codes p0300 p0305 p0306 where do I start
Submitted: 1 year ago.
Category: Lexus
Expert:  Toyota Service replied 1 year ago.
Hello. Welcome to Just Answer. Please allow me to assist you.
P0300 is a multi-cylinder misfire. PO0305 and P0306 are cylinder 5 and 6 misfires.
There are two things to do to fix this:
1) if the spark plugs have 60,000 miles on them (or more) replace them with Genuine Toyota spark plugs. Do not use anything but Toyota plugs from a Toyota parts department. Non-Toyota plugs can and will give you P0300 codes.
2) If the plugs are new, and genuine Toyota (they are 'Nippondenso', actually, but ND plugs from the autoparts stores are different), replace the coils on #5 and #6 cylinders.
One of the other should cure the problem.
If you have any questions, please feel free to reply.
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