If your oven's temperature is off, the most common culprit is a bad temperature sensor (thermistor). Replacing this part is essential as it's responsible for monitoring and regulating the oven's internal heat. 30-60 minutes $15 - $40 Diagnosis An oven that doesn't reach the correct temperature often has a faulty temperature sensor, also known as a thermistor. This part acts like the oven's internal thermometer, communicating the current heat level to the oven's control system. When this sensor malfunctions, it sends incorrect readings, causing your oven to be either too hot or too cool, which can negatively impact your baking and cooking results. Tools Needed Screwdriver set (Phillips and flathead) Nut driver set or pliers Gloves Safety glasses Oven thermometer (for testing) Warnings Always disconnect the power to the oven at the circuit breaker before starting any repairs to avoid electric shock. Wear gloves and safety glasses to protect yourself from sharp ...