Prius Diagnostic Mode Codes. Start by checking the "Possible Causes" listed above. But if a fault involves any of the components in the hybrid.
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Visually inspect the related wiring harness and connectors. Diagnostics on a Toyota Prius is similar to that on any other late model vehicle. If a problem occurs with something that is not part of the hybrid system, it will set diagnostic code that corresponds to the fault and turn on the Check Engine light.
Scan for Codes How to scan your vehicle for trouble codes.
Start by checking the "Possible Causes" listed above.
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Toyota Prius TPMS diagnostic information and troubleshooting tips, including ECU unlock closed loop The Toyota Prius is installed with a direct TPMS system, which means there are TPMS sensors in the wheel. The Diagnostic Trouble Codes or DTC's (also known simply as fault codes) are stored automatically whenever any of the sensors are outside of predetermined parameters. Hybrid Vehicle ECU Diagnostic Trouble Codes.