Why would the ECU have motor oil in it?

Tiny
KNK121009
  • MEMBER
  • 1999 TOYOTA AVALON
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
ECU is leaking a lot of motor oil! Obviously, the ECU shouldn't have motor oil in it. Where could it be coming from?
Wednesday, July 14th, 2021 AT 1:52 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
Hi,

Are you referring to the ECU under the dash? See pic 1 below. If that is the case, there shouldn't be oil anywhere near that area. Are you certain it is oil?

Under the dash is the heater core which contains coolant, and the A/C evaporator which produces water from condensation. Could that be what you are seeing?

Let me know. Also, let me know if I have the correct part you are referring to.

Take care,

Joe

See pic below.
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Wednesday, July 14th, 2021 AT 9:31 PM

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