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Heating and Cooling› Thermostats, Housings and Fillers
Yota 1 Performance
Thermostat
SKU: 90916-03129
Easy — 1–2 hours
Overview
This thermostat replaces part numbers 90916-A3003, 90916A3003, 90916-03129, 9091603129, 90916-A3002, 16325-62010, and 90916A3002. It is constructed with premium materials for durability and features a stainless steel mounting flange and channel-constructed stainless steel spring frame.
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Vehicle Symptoms
- Engine temperature gauge reads below normal while driving
- Inconsistent heater output – blows cold then hot
- Engine overheating after highway driving or idling
- Coolant leak around thermostat housing
- Check engine light on with engine temperature issues
Diagnostic Codes
- P0128 – Coolant Thermostat Temp Below Regulating Temp
- P0125 – Insufficient Coolant Temp for Closed Loop
- P0126 – Insufficient Coolant Temp for Stable Operation
Relevant Conversations
- P0128 code on Toyota 4Runner – replace thermostat?
- engine running cold after warm up – thermostat stuck open
- Toyota thermostat replacement guide 90916-03129
- heater blows cold air at idle – thermostat?
- engine overheating but coolant full – thermostat symptoms
- Thermostat vs coolant temperature sensor – how to tell
- P0125 and P0126 both appearing – what part?
- Yota 1 Performance thermostat vs OEM Toyota
- coolant leak from thermostat housing – replace or just gasket?
- check engine light with fluctuating temperature – thermostat fix
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Yota 1 Performance |
| Part Number | 90916-03129 |
| Category | Heating and Cooling |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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