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Old 11-06-2020, 10:56 AM   #1
Scooby Newbie
Member#: 520053
Join Date: Nov 2020
Default 06 Impreza 2.5 AT low idle issues

I'm ripping my hair out trying to find the cause for the car idling at 250 rpm or so while in gear.

I've cleaned the throttle body, MAF, replaced the upstream 02 sensor, reset the ecu and idle relearning procedure. Checked for vacuum leaks, exhaust leaks, changed the fuel filter. Spark plugs were changed about 10k miles ago.

Other than the low idle, the car runs just fine. Accelerates at partial and WOT fine, no missing or power loss. When I come to a stop the car dips down to 250rpm. I had one CEL p0171 at the start of the issue but it has not come back yet.

Any advise on where to look next?
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