What do these codes mean? PO 303 & PO 305
Asked by Perdana_961 Jan 29, 2017 at 07:05 PM about the 2006 Lexus GS 300 AWD
Question type: Maintenance & Repair
A light came on on my dash. I took my car into my friend who owns his own shop and he came up with 2 codes - PO 303 & PO 305.
What do they mean?
2 Answers
P0303 LEXUS - Cylinder 3 Misfire Detected... Possible causes; Faulty spark plug 3, Clogged or faulty fuel injector 3, Faulty ignition coil 3, Fuel injector 3 harness is open or shorted, Fuel injector 3 circuit poor electrical connection, Ignition coil 3 harness is open or shorted, Ignition coil 3 circuit poor electrical connection, Insufficient cylinder 3 compression, Incorrect fuel pressure, Intake air leak......P0305 LEXUS - Cylinder 5 Misfire Detected.... Possible causes; Faulty spark plug 5, Clogged or faulty fuel injector 5, Faulty ignition coil 5, Fuel injector 5 harness is open or shorted, Fuel injector 5 circuit poor electrical connection, Ignition coil 5 harness is open or shorted, Ignition coil 5 circuit poor electrical connection, Insufficient cylinder 5 compression, Incorrect fuel pressure, Intake air leak.... The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 5. If the problem persist more tests needs to be done to diagnose problem.
Perdana_961 answered 7 years ago
Thank you for your quick response. I appreciate your help.
