2001 Rav4.
45,000 miles.
Got the CEL/P1155 code.
Checked sensor heater resistence, it's ok (2.6 Ohms). Checked fuses, relay, voltage from ECM. All ok.
Cleared code. Drove for several hours, street and highway, no CEL. Parked, and after 15 minutes at idle, the CEL light comes on.
I've repeated this a couple of times, and get the same result: CEL light comes on after idling for a while.
WHAT IS GOING ON?!
45,000 miles.
Got the CEL/P1155 code.
Checked sensor heater resistence, it's ok (2.6 Ohms). Checked fuses, relay, voltage from ECM. All ok.
Cleared code. Drove for several hours, street and highway, no CEL. Parked, and after 15 minutes at idle, the CEL light comes on.
I've repeated this a couple of times, and get the same result: CEL light comes on after idling for a while.
WHAT IS GOING ON?!