B1421 Toyota Prius

Most Toyota Prius drivers are familiar with the distinctive “check engine” light that comes on when the hybrid battery needs to be replaced. What many don’t know, however, is that there’s another code – B1421 – which indicates a problem with the vehicle’s inverter. This can be a costly repair, so it’s important to be aware of what it means and how to avoid it.

The B1421 Toyota Prius code is a diagnostic trouble code (DTC) for “B” Camshaft Position Actuator Circuit Open Bank 1. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your vehicle.

b1421 solar sensor circuit (passenger side) & b1424 solar sensor Ciecuit (Driver side) Ristra

2008 Toyota Prius Code B1421

The 2008 Toyota Prius comes with a built-in code system that helps to protect your car from theft. The code is B1421 and it is located on the door lock cylinder. This code must be entered into the keyless entry system in order to unlock the doors.

If you enter the wrong code, the doors will remain locked and the alarm will sound.

B1421 Toyota Prius

Credit: carspecmn.com

What is B1421?

B1421 is a code used to indicate a particular diagnostic trouble. It stands for “Battery Voltage Low” and is set when the battery voltage drops below a certain threshold. This can happen for various reasons, such as a loose battery terminal connection, or a problem with the charging system.

If you see this code, it’s important to have your vehicle checked out by a qualified technician as soon as possible.

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What is a Solar Sensor Toyota?

A solar sensor is a device that converts sunlight into an electrical signal. Solar sensors are used in a variety of applications, including solar power, solar thermal energy, and space-based observations. Solar cells are the most common type of solar sensor.

Solar cells are made of materials that exhibit the photovoltaic effect, which allows them to convert light into electricity. Solar cells are typically made of silicon, but can also be made from other semiconductor materials such as cadmium telluride or copper indium selenide. Solar cells are used in a wide variety of applications, including:

• solar power plants; • solar water heaters; • solar street lights; and

• portable solar chargers for electronic devices. Solar thermal collectors are another type of solar sensor. Solar thermal collectors capture sunlight and convert it into heat energy.

This heat energy can then be used to generate electricity or to heat water or air for domestic or commercial use. Solar thermal collectors are typically made from metal or glass and have a coating that absorbs sunlight but reflects infrared radiation (heat).


The B1421 Toyota Prius fault code is a generic powertrain code. It’s considered to be general because it applies to all makes and models of vehicles. The code is triggered when the Engine Control Module (ECM) detects a problem with the engine coolant temperature sensor circuit.

This can be caused by a number of things, such as a faulty sensor, an electrical short, or a loose connection. When this code is stored, it’s important to have the vehicle inspected by a qualified technician so that the cause can be properly diagnosed and repaired.

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