p1121
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2008 Prius – Low Power on Highway & Uphill, Loud Engine, P1121 Code, Throttle Already Replaced
Hi everyone, I’m having an issue with my 2008 Prius. When going uphill or trying to accelerate fast, it feels very weak. The engine gets loud, but...
Thread by: YazanTh, Oct 22, 2025, 15 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting -
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P1121 Fail fix
I tried to fix my p1121 error code by replacing the 3-way coolant control valve. I even got OEM. I ended up spilling all the coolant on the...
Thread by: PrestonH2O, Aug 10, 2025, 5 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting -
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P1121 Goose Chase
Hello, new Prius (and car) owner here. My 2008 threw a P1121 code (coolant control valve), but my mechanic could not get the valve to fail and...
Thread by: Ednajeb, Nov 16, 2024, 2 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting -
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Check Engine Codes
Hi everyone! I recently purchased a 2008 Toyota Prius Standard 2 days ago. Now the check engine light is on. It is throwing 2 codes : P1116 &...
Thread by: Kazoo_Man, Jun 13, 2024, 4 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting -
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P1121 Error Code
I have a 2009 Prius with 179k miles. I was driving home from work and my Malfunction Indicator Lamp warning light came on. Once I made it home, I...
Thread by: 2009PriusDriver, Nov 30, 2022, 3 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting -
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Winter Is Coming - Coolant Valve (P1121) & Inverter Pump replacement + maintenance at 200k miles
Been reading the forum for a long time & just now signed up to get some specific advice. Huge thanks to everyone's contributions to this forum!...
Thread by: Danny S, Nov 7, 2022, 4 replies, in forum: Gen 2 Prius Care, Maintenance and Troubleshooting
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