alfred_steel5

CLA Hybrid Charge Air Temperature Sensor Issue

My 2020 Mercedes CLA hybrid is throwing a charge air temperature sensor error and I'm seeing some concerning symptoms. The check engine light is on, and the car's noticeably lost power. I'm also hearing a whistling noise, almost a loud hissing sound when I accelerate. Pulled the code and it's definitely related to the charge air temperature sensor circuit. I suspect a defective cable or plug connection based on some research. Mileage is at 286784 km. Has anyone else encountered this before I start tearing things apart?

4 comment(s)

Ugh, sounds familiar. I had a similar experience with my CLA. Whistling and power loss are no fun. Have you checked the airflow sensor and the connection to the charge sensor itself? A loose connection can cause issues. Is the air temperature reading plausible, or is it way off?

Thanks for the quick response. I haven't checked the airflow sensor specifically, I was focusing on the charge sensor. When you say 'way off', what kind of readings are we talking about? Any specific pins or wires on the connector I should be paying extra attention to?

Well, my air temperature readings were completely erratic. I'd advise you to take it to a workshop and get it checked out. It is probably an issue with the engine sensor.

Appreciate the insight! It turned out to be a corroded connector on the charge air temperature sensor, just as you suspected. Cleaned it up, applied some dielectric grease, and the error's gone. Total cost: 95€ for the sensor. Thanks again for pointing me in the right direction.

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