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Old 12-04-2002, 05:51 PM
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pmizell pmizell is offline
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838

Are you still getting 2 different set lambda %'s? You stated you read 20% one time then 30% another.

According to 0.73-0121 "Testing electrical components of the KE injection system" p. 17 -- a 20% FOM fault indicates "Full load contact incorrectly connected or faulty. 20% readout only if throttle valve switch (S 29/2) operated."

30% would indicate a problem with your big coolant temperature sensor. It's 4 pin black, at rear of head and gives KE and EZL input into the control unit. 30% could also indicate a short or open circuit in your control unit.

I'm not up to speed on the problems you are having, but if you're experiencing poor fuel economy I would suspect the coolant sensor as the problem, but don't quote me on that since I don't know the circumstances surrounding your problem.

You want to be at pin 3 to check the on-off (lambda) ratio.

Also, if you have a pulse code reader, you can check for fault codes at the diagnostic code box on other side near battery.

Good luck
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi
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