87 260E. It does not have onboard diagnostic computer. On a car with OBD II, I assume it is much simpler because the computer will tell you when the sensor goes bad and perhaps the test that the OBD system conducts now is a more stringent test than what MB was doing in older cars. But it is also a fact that the old test was adequate because the emissions from my car were just fine.

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Saumil S. Patel