If you get the codes and post them on this thread, PriusOnline members can help you determine the most probable cause for your problems.įinally, your best (and most expensive) option is to take your Prius to a Toyota dealer. Most auto parts stores (AutoZone, O'Rielly's, and similar) will read the codes for you for free (or loan you the meter to read them yourself) or you can purchase one (they are not too expensive). There are other hybrid system and ICE problems that may cause these symptoms, but you need to obtain the fail codes to troubleshoot the problem. This has happened twice with our Prius and both oil changes were performed by the same Toyota dealer where we purchased our car, new, in 2002. If you (or the Toyota dealer's service department) added 4 quarts, this may cause a FAILED-TO-START error. The crankcase holds exactly 3.7 quarts of oil. Note: Overfilling the crankcase will allow motor oil to be sucked into the ICE, which will contaminate the mass airflow sensor and cause the engine to stumble when the START/RUN command is issued. Have you recently had periodic maintenance performed? Specifically, have you had the ICE engine oil and filter changed? Is the 12-volt battery defective (discharged or worn out/won't hold a charge)? You should start by checking the obvious: However, the original defect that caused the FAILED-TO-START error may still exist. You can reset the system by disconnecting the 12-volt battery for several minutes, and then reconnecting it. However, the error code will appear when a scan meter retrieves any error codes that exist. The symptoms may appear as if the ICE stumbled/stalled, or the ICE may just not start at all. If the ICE is not running, a FAILED-TO-START error code is recorded, and the hybrid computer will not issue further START/RUN commands. When the computer sends a START/RUN command, a sensor checks to verify that the ICE is running after a short delay (less than a second). The ICE (Internal Combustion Engine) is controlled by the hybrid system.
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