My parking sensors don't work. When you turn them, you can hear a loud, long beep and you see 2 bars on the displays.
Last time it had 3 bad sensors where 2 of them were faulty and 1 of them showed a broken wire. Broken wire has been fixed and the 2 faulty sensors have been replace, however the sensors still don't work. When we used the Mercedes STAR system to read for any error codes, it didn't give any, like last time. The parking sensor was an optional extra, not an aftermarket version.
Any idea what might be the problem?