Laurance

P0301 means "Cylinder 1 Misfire Detected" Possible causes - Faulty spark plug 1 - Faulty ignition coil 1 - Ignition coil 1 harness is open or shorted - Ignition coil 1 poor electrical connection - Clogged or faulty fuel injector 1 - Injector 1 harness is open or shorted - Injector 1 poor electrical connection - Improper spark plug 1 - Insufficient cylinder 1 compression - Incorrect fuel pressure - Intake air leak learn more at: http://www.uobd2.com/upload/service/diagnostic-trouble-code-table.pdf Symptoms: -Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation

Hi, dear, I notice you post a link: http://www.uobd2.com/wholesale/mini-vci-for-toyota-tis-techstream-v500028-1888.html do you mean you bought Techstream from here? but as I know users are not allowed to buy an additional cable to use, otherwise this Toyota techstream will not work, and techstream only works as tester not programmer. Good luck!