the plug for the third sensor is under the rear seat.you can compare the resistance of all three.measure on a 2kohm scale and you will find that one is very different from the others.this is causing the light to come on and the system to shut down.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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