I did my first duty cycle check. At the X11 port, pins 2 and 3 with the ignition on, engine off I get a reading of 70.2%, which drops to 0 after 5 seconds.

With the engine running I see 72-73% regardless of which way I turn the tower screw, both at idle and 2500 rpm. It seems fixed in that range, so what does that mean? I didn't check the O2 sensor yet since I have trouble locating the wire coming into the cabin.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma