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    Mari_lopez's Avatar
    Mari_lopez Posts: 1, Reputation: 1
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    #1

    Jul 24, 2012, 08:25 AM
    Lexus rx300 diagnostic codes P0303
    Spark plugs have been changed and fuel has also been changed. Code still coming up after reset. What else could be the problem?
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #2

    Jul 24, 2012, 11:07 AM
    Quote Originally Posted by Mari_lopez View Post
    Spark plugs have been changed and fuel has also been changed. Code still coming up after reset. What else could be the problem?
    Oh, let's see... :
    Loose connection
    Faulty injector
    Faulty plug wire
    Valve clearance, intake or exhaust

    You will need to determine if you're losing spark or fuel when this misfire code is set.

    https://www.askmehelpdesk.com/cars-trucks/when-asking-about-your-vehicle-303903.html
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