Mechanics

RUNNING RICH AND WONT IDLE

2007 Subaru WRX

Engine Performance problem
2007 Subaru WRX 4 cyl All Wheel Drive Manual 50000 miles

should the o2 sensor heat up when the key is in the on position
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Ksubaruwrx
June 27, 2010.



Hi there,

These are heated O2 sensors, if they are faulty the ECU will go to a full rich reading, this well may be your problem.

Mark (mhpautos)

Mhpautos
Jun 28, 2010.
Which o2 sensor? The car has two. The front one is considered to be a a/f sensor but looks just like a o2 sensor. The other is after the turbo. Also the bov starts flowing air when I plug the vacuum line in

Tiny
Ksubaruwrx
Jun 29, 2010.