What are the most common Toyota Prius problems?
According to Au7o's analysis of 7,580+ owner reports, the 2004-2004 Toyota Prius has 5 documented issues. The most frequently reported are: Hybrid Battery Pack (HV Battery) Failure, Inverter Coolant Pump Failure, 1NZ-FXE Head Gasket Failure and EGR Cooler Issues. Of these, 4 are rated critical and should be addressed promptly.
Is the Toyota Prius reliable?
The 2004-2004 Toyota Prius has 5 known issues documented across 7,580+ owner reports. 4 issues are rated critical: Hybrid Battery Pack (HV Battery) Failure and Inverter Coolant Pump Failure and 1NZ-FXE Head Gasket Failure and EGR Cooler Issues and Catalytic Converter Theft Vulnerability. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Toyota Prius problems?
Repair costs for known Toyota Prius issues range from $150 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Hybrid Battery Pack (HV Battery) Failure, typically costs $1,200-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2004-2015 Toyota Prius Hybrid Battery Pack (HV Battery) Failure?
Gen 2 (2004-2009) and Gen 3 (2010-2015) Prius NiMH battery packs commonly fail between 8-15 years. Individual cell degradation causes voltage imbalances, triggering warning lights and reduced performance. Battery cooling fan clogging accelerates failure. Repairs typically run $1,200-$3,500. Severity: high.
What is the 2004-2009 Toyota Prius Inverter Coolant Pump Failure?
The electric inverter coolant pump (G9020-47031) on Gen 2 Prius fails without warning, causing the inverter to overheat. If not caught quickly, overheating can destroy the inverter assembly ($3,000+ repair). Pump typically fails between 100,000-180,000 miles. Repairs typically run $200-$600. Severity: high.
What is the 2004-2009 Toyota Prius 1NZ-FXE Head Gasket Failure and EGR Cooler Issues?
The 1.5L 1NZ-FXE engine can develop head gasket failure allowing coolant and oil mixing, often linked to EGR cooler problems that cause localized hot spots. Typically appears after 150,000+ miles. External coolant leaks may also occur at the head gasket mating surface. Repairs typically run $1,200-$2,500. Severity: high.
What is the 2004-2025 Toyota Prius Catalytic Converter Theft Vulnerability?
The Toyota Prius is the single most targeted vehicle for catalytic converter theft in the United States. The Prius catalytic converter contains higher concentrations of precious metals (palladium, rhodium, platinum) than most vehicles because the hybrid system results in a cleane… Repairs typically run $150-$3,000. Severity: high.
What is the 2004-2025 Toyota Prius 12V Auxiliary Battery Drain and Failure?
The 12V auxiliary battery in the Prius is critical for powering the vehicle computer systems that must boot up before the hybrid system can start. Unlike conventional cars where a weak battery can still crank the engine, a dead 12V battery in the Prius means the vehicle will not… Repairs typically run $150-$300. Severity: medium.
