check engine light po400 - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 03-25-2010, 06:00 PM Thread Starter
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Date registered: Mar 2010
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Question check engine light po400

I recently purchased a 2000 E320. It has 175kmiles and i have a check engine light. I cleaned the egr tube which was gunked up at the end that goes into the intake. I tested the egr valve with a vacuum tested and it moves in and out. I replaced the gas cap with an after market one. The light is still on. The car runs smooth. I cleared the code with my scanner but the light is still on. Do I need to disconnect the battery to get rid of the light and if so I will lose the radio and I do not have the code for it. Any help will be appreciated Rich:
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