P1121 Toyota Prius
Code P1121 Toyota Prius Description The P1121 diagnostic trouble code (DTC) for the Toyota Prius indicates a problem with the Coolant Flow Control Valve Position Sensor Circuit. This sensor is responsible for monitoring the position of the coolant flow control valve, which regulates the flow of coolant through the engine. P1121 - Coolant Control Valve Replacement (with pics) Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by Stomper88, Jan 24, 2012.
Learn how to fix the P1121 error code that indicates a malfunctioning coolant flow valve in your Prius. The web page explains the function, location and replacement of the valve, and the possible additional codes related to the coolant system. Second, it's a common problem with the Gen 2 Prius (2004-2009).
Check out this short video that shows you exactly how to replace your coolant control valve the easy way. Former Toyota certified dealership technician here and owner of a 2009 Prius: Direct from AllData but you can get the same info in a DIY friendly price and better format at Mitchell 1 DIY-Do it Yourself Automobile Repair Manuals 1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1121: Coolant Flow Control Valve Position Sensor Circuit Stuck. Knowing Toyota OBD DTC P1121: Coolant Flow Control Value Problems If you've encountered the P1121 diagnostic trouble code (DTC) in your Toyota vehicle, particularly in a Prius, you may be wondering what it means and how to address it.
This guide will provide you with essential information about this code, its implications, and potential. P1121- can i drive on it? Discussion in ' Gen 2 Prius Main Forum ' started by ericspoor, Aug 26, 2018. The second generation Prius, model years 2004-2009, uses a 3-way valve to control coolant flow between the engine, the hot coolant storage tank (thermos), and the heater core.
DTC No. Detection Condition Trouble Area P1121 Water valve position sensor output voltage: No change despite the ECM sending a valve control signal or slow response CHS tank outlet temperature sensor output: 60 C or more (when hot coolant recovering starts) CHS tank outlet temperature sensor output: No change despite the hot coolant is. P1121 Fail fix Discussion in ' Gen 2 Prius Care, Maintenance and Troubleshooting ' started by PrestonH2O, Aug 10, 2025.
