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Old 10-07-2002, 01:38 PM
suginami suginami is offline
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,503
Code #5 is for the O2 sensor.

I am 100% convinced that you need to replace your engine wiring harness.

You have all of the symptoms

Rough idleing, missing, stumbling, random and arbitrary fault codes.

It's your wiring harness. About $550 for the part and 2.5-3 hours labor.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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