How to Replace the Thermostat — 2020-2025 Toyota Corolla

Replacing the thermostat on a 2020-2025 Toyota Corolla is essential if you're experiencing overheating, poor heater performance, or erratic temperature gauge readings. This DIY repair can save you significant labor costs, with parts costing between $30-$60 compared to $150-$250 at a shop. With the right tools and this guide, most DIYers can tackle this job confidently in a couple of hours. DIY Cost: $30-$60 | Shop Cost: $150-$250

You’re done. Clear any stored codes with your scanner and complete a normal drive cycle so the vehicle’s readiness monitors reset.

If the code returns, the root cause likely wasn’t the part you replaced — go back through the diagnostic steps before swapping anything else.