There must be some resonant frequency in the engine or exhaust system of certain trucks and buses. This alarm stops as soon as the truck moves. I have also had mine false alarm when a sensor got wet or dirty. A little drop of water covering the gap around the center of the sensor is all it takes sometimes.
Good morning, I have a problem with the Ford S-MAX, parking sensors do not work. After connecting the computer, if he wants to check if there is any error, it does not detect the sensor module, and the button in the car, which could be used to turn on or off the parking sensors, does not light up.
The parking aid module does this by calculating the distance to an object by the use of four parking aid sensors mounted in the rear bumper. The sensors can detect objects approximately 1m to the rear of the vehicle. An intermittent warning tone is generated from the speaker in the parking aid speaker, located on the central junction box (CJB).

2) Both front and rear sensors are connected to PSM_MZ module located behind glove box right side. You should check first that you have this module and the harness to it is full. 3) You need new indicator unit with parking sensor button.

***2/2/2019 Update*** Solved, Issue Hasn't Reoccurred Just today my front far left sensor started going off constantly when I go at low speeds. Doesn’t stop. I think it is mainly because of the weather/wind. The sensor is directly where the wind is coming from. Started this morning. I tried cleaning it but really there wasn’t anything to

Ford Part Type Years Qualifier Part # C-Max A/C Pressure Transducer Connector 2013-2018 Terminal: Silver; Leads: 3; Gauge: 20 WPT-1400 Air Bag Connector 2013-2018 Deactivation; Passenger; Terminal: Silver; Leads: 12 WPT-1166 2013-2018 Seat Back; Passenger; Vent; Leads: 2; Gauge: 20; Color: Black, Yellow, Red WPT-1228
A4goj.
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    • ford c max parking sensor module location