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Originally Posted by WienerWater
Had a tech in Vancouver B.C explain how to test your CPS, if it starts to fail. He said connect to an ohmeter, should read a steady 850-1200 ohms. using an air heat gun, start warming the sensor (not hot,but warm as it's plastic), keeping a steady ohm reading, and it should not change much. Mine started to go up fast to infinity, or just lose a reading. QWhen it cooled down, reading started.But if it does goe to infinity (open) then there's probably an open wire in the coil that is heat sensitive.
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In the 8 years I been at my tech's MB shop, I NEVER seen a bad CPS from the older MB, such as mine; 92 to 96 S or E class but he says that in the newer car 2001 and on, it gets replaced a lot.
It sort of boggles my mind, since it's just a magnet and coil of wire, so what can go bad?? Obviously, the heat must 'melt' the wire coating causing it to open. Bottom line it must be poor quality control!
In the old manuals, the TEST for this part is JUST an ohmmeter calling for a 850 - 1200 ohms. No other test.