How to Install Temperature Sensor 00425301 in a Bosch Oven

Quick answer: The sensor is a thin metal probe inside the oven cavity that reports temperature to the control board; remove the old one and fit the new one with power off. To test, set a mid-range bake such as 350°F (175°C), run a full preheat, and confirm the oven reaches temperature and cycles normally.

How to Install Temperature Sensor 00425301 in a Bosch Oven

The temperature sensor is a thin metal probe mounted inside the oven cavity that reports the current temperature to the control board, which uses that reading to cycle the heating elements on and off. When it fails, the oven can run hotter or cooler than the set temperature, bake unevenly, display an error code, or in some cases fail to heat at all. Because the control board relies entirely on this one reading to decide when to cycle the elements, a sensor that drifts even slightly out of calibration can throw off every bake and roast you run until it is replaced. Replacing sensor 00425301 is a contained repair that most people can complete in 30 to 60 minutes with basic hand tools.

Tools you will need

  • Phillips #2 screwdriver
  • Nut driver or socket set
  • Needle-nose pliers
  • Flashlight
  • Multimeter (optional, for checking the connector)

Safety first

  • Unplug the oven, or switch off the circuit breaker that feeds it — a hardwired oven must be disconnected at the breaker, since there is no plug to pull.
  • Let the oven cavity cool completely before touching interior panels; the sensor sits close to the heating elements.
  • Do not attempt any repair beyond the plug-in sensor connector. If you see burnt wiring, smell gas, or the job involves anything beyond the sensor itself, stop and call a licensed technician.

Removing the old sensor

  1. Unplug the oven or switch off the circuit breaker, and confirm it is off with a non-contact voltage tester if you have one.
  2. Open the oven door and locate the sensor — a small metal probe mounted on the back or side wall of the cavity, usually near the top.
  3. Remove the two mounting screws holding the sensor bracket to the cavity wall.
  4. Gently pull the sensor forward just far enough to reach the wire connector behind the cavity wall — pull on the connector, not on the wire itself.
  5. Unplug the connector, noting its orientation, and pull the old sensor assembly out through the cavity opening.

Installing the new sensor

  1. Feed the new sensor's wire lead through the same opening in the cavity wall.
  2. Reconnect the wire connector, making sure it seats fully.
  3. Position the sensor bracket against the cavity wall in the same location and orientation as the original part.
  4. Reinstall the two mounting screws, snug but not overtightened, since the bracket is thin sheet metal.
  5. Tuck any slack wire behind the cavity wall so it cannot touch a heating element.
  6. Restore power at the breaker, or plug the oven back in.

Testing the repair

Set the oven to a mid-range bake temperature, such as 350°F (175°C), and let it run a full preheat cycle. Confirm it reaches temperature and cycles normally rather than running continuously or shutting off too early, and check the control panel for any error codes once the cycle finishes. If your owner's manual describes a calibration or self-test mode, run it after replacing the sensor.

Common mistakes

  • Touching the sensor probe tip during handling, which can affect its reading.
  • Letting the wire lead rest against a heating element, which can melt the insulation.
  • Forcing the connector on in the wrong orientation.
  • Skipping the cooldown period and working near hot elements.

Related Repair Guides

  • Bosch parts catalog
  • Why is my Bosch oven temperature issue?
  • Why is my Bosch oven not heating?
  • Why is my Bosch oven broken/damaged?
  • Why is my Bosch oven showing an error code?

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