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1999 Mercedes Benz CLK320 Scan Code 0400 EGR malfunction

Tiny
FILLIP66
  • MEMBER
  • 1999 MERCEDES BENZ CLK320
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
My Check Engine light came on, I ran a scan and got a 0400 EGR Malfunction code. I have located what I think are the EGR valves (there are 2). Can they be removed, cleaned and replaced as opposed to replacing?

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Friday, July 18th, 2008 AT 12:43 PM

2 Replies

Tiny
KLSHIEL
  • MECHANIC
  • 163 POSTS
I have never tried to clean them, but you can try some carburator cleaner to see if it helps. EGR valves usually just stop working properly rather than becoming clogged.
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Friday, July 18th, 2008 AT 12:55 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
You are dead on cleaning is the way to go. Make sure you clean prots in the intake. And check vacuum to valves the RPMS up at 2000
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Friday, July 18th, 2008 AT 12:56 PM

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