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Should be lots of info in the archives about this. Search on diagnostic module. If your car comes equipped with it (I'm not sure USA versions had it in '89, only Calif versions), it'll be a small black plastic box like the one in photo below, mounted just to the right of the battery. Under the lid is a button and a red LED. With the ignition ON, motor OFF, push and hold the button 2-4 seconds. When you let up, the LED will flash a number of times. The chart below indicates what the flashes mean. If the LED flashes more than once, record the number and look it up. Then push and hold the button 2-4 seconds and the next code will be flashed, and so on until the first code is flashed once again, indicating that you are repeating the cycle. After each code is flashed, it can be erased from memore by pushing and holding the button 6-8 seconds.
Pulses
1 -- No fault in system
2 -- throttle valve switch, full load contact
3 -- Coolant temperature sensor
4 -- Air flow sensor position indicator
5 -- Oxygen sensor
6 -- Not assigned
7 -- TF signal
8 -- Altitude correction sensor
9 -- Electrohydraulic actuator
10 -- Throttle valve switch, idle speed contact
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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member
Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'
There are only 10 kinds of people in the world--those who understand binary and those who don't
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