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.
2008 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE
Typical Enabling Conditions
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not present | P0011 (VVT system 1 - Advance) P0012 (VVT system 1 - Retard) P0031, P0032 (A/F sensor heater - Sensor 1) P0037, P0038 (O2 sensor heater - Sensor 2) P0100 - P0103 (MAF meter) P0115 - P0118 (ECT sensor) P0120 - P0223, P2135 (TP sensor) P0125 (Insufficient ECT for closed loop) P0136 (O2 sensor - Sensor 2) P0171, P0172 (Fuel system) P0300 - P0304 (Misfire) P0335 (CKP sensor) P0340, P0341 (CMP sensor) P0351-P0354 (Igniter) P0500 (VSS) P2196 (A/F sensor - Rationality) P2237 (A/F sensor - Open) P2A00 (A/F sensor - Slow response) |
| Battery voltage | 11.0V or more |
| Intake air temperature | -10°C (14°F) or more |
| Engine coolant temperature | 70°C (158°F) or more |
| Atmospheric pressure | 75.981 kPa (570 mmHg) or more |
| Idle | OFF |
| Engine speed | Less than 3,200 rpm |
| A/F sensor | Activated |
| Fuel system status | Closed-loop |
| Engine load | 10 to 70% |
| All of the following condition are met: | 1.2 and 3 |
| 1. MAF | 5 to 30 glsec. |
| 2. Front catalyst temperature (estimated) | 420 to 800°C (788 to 1472°F) |
| 3. Rear catalyst temperature (estimated) | Less than 290°C (554°F) |
| A/F sensor monitor | Completed |
| Rear HO2S monitor | Completed |
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.