Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Relative Humidity (RHS) Sensor
The relative humidity sensor measures the humidity of the intake air by using a membrane allowing air to enter the cell while protecting it from liquid contaminants and dust. Relative humidity is the ratio of water vapor present in the air compared to the maximum amount the air can hold at that temperature and pressure.
The intake air humidity measurement is a key parameter for engine management. The PCM uses the input from the relative humidity sensor to adjust EGR flow rates in high humidity environments.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.