Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Toyota Prius LE AWD-eFACTORY OEM SERVICE PROCEDURE
Engine Control System - Diagnostic Codes (3 Of 8)
- SFI System
- DTC P014C-00: O2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; DTC P014D-00: O2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1; DTC P015A-00: O2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1; DTC P015B-00: O2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1 [12/2018 - ]
- DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1 [11/2015 - 12/2018]
- DTC P0171-00: System Too Lean Bank 1; DTC P0172-00: System Too Rich Bank 1 [12/2018 - ]
- DTC P0220-11: Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground [11/2015 - ]
- DTC P0220-15: Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open [11/2015 - ]
- DTC P0300-00: Random/Multiple Cylinder Misfire Detected; DTC P0300-27: Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold; DTC P0300-85: Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range; DTC P0301-00: Cylinder 1 Misfire Detected; DTC P0302-00: Cylinder 2 Misfire Detected; DTC P0303-00: Cylinder 3 Misfire Detected; DTC P0304-00: Cylinder 4 Misfire Detected [11/2015 - 12/2018]
- DTC P0300-00: Random/Multiple Cylinder Misfire Detected; DTC P0300-27: Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold; DTC P0300-85: Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range; DTC P0301-00: Cylinder 1 Misfire Detected; DTC P0302-00: Cylinder 2 Misfire Detected; DTC P0303-00: Cylinder 3 Misfire Detected; DTC P0304-00: Cylinder 4 Misfire Detected [12/2018 - ]
- DTC P0325-11: Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground [11/2015 - ]
- DTC P0325-15: Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Battery or Open [11/2015 - ]
- DTC P0335-2A: Crankshaft Position Sensor "A" Signal Stuck in Range; DTC P0335-31: Crankshaft Position Sensor "A" No Signal [11/2015 - ]
- DTC P0335-62: Crankshaft Position Sensor "A" Signal Compare Failure [11/2015 - ]
- DTC P0340-11: Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Ground; DTC P0340-15: Camshaft Position Sensor "A" Bank 1 or Single Sensor Circuit Short to Battery or Open [11/2015 - ]
- DTC P0340-2A: Camshaft Position Sensor "A" Bank 1 or Single Sensor Signal Stuck in Range; DTC P0340-31: Camshaft Position Sensor "A" Bank 1 or Single Sensor No Signal [11/2015 - ]
- DTC P0351-13: Ignition Coil "A" Circuit Open; DTC P0352-13: Ignition Coil "B" Circuit Open; DTC P0353-13: Ignition Coil "C" Circuit Open; DTC P0354-13: Ignition Coil "D" Circuit Open [11/2015 - ]
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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