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1998 Subaru Outback cleaned TB now check engine light is on

Tiny
BOGUSDILL
  • MEMBER
  • 1998 SUBARU OUTBACK
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 204,000 MILES
I recently cleaned my throttle body and was carefull not to spray to much STP TB cleaner in the throttle body an it started and ran better than it had for a long time. The next day I was driving it and the check engine light came on. There were 2 codes that popped up, I cleaned the EGR valve to and it works properly. Can you tell me what else might cause the check engine light to come on?
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Wednesday, August 27th, 2008 AT 3:14 AM

6 Replies

Tiny
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  • MECHANIC
  • 31,937 POSTS
Hi there,

You will have to check the codes and see what they stand for, and when the problems fixed you will have to get the codes cleared from the ECU.

Mark (mhpautos)
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Wednesday, August 27th, 2008 AT 5:42 AM
Tiny
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  • 4 POSTS
The code is P0400 and it means EGR flow malfunction. What could I have done to cause this malfunction? Thank you for your help.
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Wednesday, August 27th, 2008 AT 7:30 PM
Tiny
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Hi there,

There may be that there is a small amount of carbon stuck under the vale causing it to leak when closed.

Mark (mhpautos)
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Wednesday, August 27th, 2008 AT 7:47 PM
Tiny
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Thank you I think that mite have been the problem because when I removed it I noticed quite a bit of gunk so I cleaned it out and reset the check engine light and it hasnt come back on yet but im keeping my fingers crossed! If it comes back on are there any other things I should try to do?
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Wednesday, August 27th, 2008 AT 11:24 PM
Tiny
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If the code is for the EGR valve don't do anything else, I feel that if you get all the muck out you should be ok.

Mark (mhpautos)
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Thursday, August 28th, 2008 AT 1:01 AM
Tiny
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Well the light came back on after I cleaned the EGR what else could the problem be? Do you have any ideas cause im totally lost
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Tuesday, September 9th, 2008 AT 2:23 AM

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